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From 59c0d659fc71b47278c2faadaa844e8516454626 Mon Sep 17 00:00:00 2001
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From: Lukas Slebodnik <lslebodn@redhat.com>
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Date: Fri, 28 Jun 2019 16:27:21 +0200
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Subject: [PATCH 2/2] PROXY: Return data in output parameter if everything is
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OK
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The function remove_duplicate_group_members might return EOK also in the middle
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of function but return parameter was not set with right data.
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Processing continued in the function save_group but there was a
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dereference of NULL pointer.
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Introduced in: https://pagure.io/SSSD/sssd/issue/3931
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Crash:
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(gdb) bt
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#0 0x00007fb4ce4a9ac5 in save_group (sysdb=sysdb@entry=0x55c9a0efb230, dom=dom@entry=0x55c9a0efb420, grp=grp@entry=0x55c9a0f370f0, real_name=0x55c9a0f47340 "nobody@ldap",
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alias=alias@entry=0x0) at src/providers/proxy/proxy_id.c:748
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#1 0x00007fb4ce4aa600 in get_gr_gid (mem_ctx=mem_ctx@entry=0x55c9a0f38be0, sysdb=sysdb@entry=0x55c9a0efb230, dom=dom@entry=0x55c9a0efb420, gid=99, now=<optimized out>,
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ctx=<optimized out>) at src/providers/proxy/proxy_id.c:1160
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#2 0x00007fb4ce4ac9e5 in get_initgr_groups_process (pwd=0x55c9a0f384a0, pwd=0x55c9a0f384a0, dom=0x55c9a0efb420, sysdb=0x55c9a0efb230, ctx=0x55c9a0f048e0, memctx=0x55c9a0f38be0)
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at src/providers/proxy/proxy_id.c:1553
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#3 get_initgr (i_name=<optimized out>, dom=0x55c9a0efb420, sysdb=<optimized out>, ctx=0x55c9a0f048e0, mem_ctx=0x55c9a0f38b70) at src/providers/proxy/proxy_id.c:1461
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#4 proxy_account_info (domain=0x55c9a0efb420, be_ctx=<optimized out>, data=<optimized out>, ctx=0x55c9a0f048e0, mem_ctx=0x55c9a0f38b70) at src/providers/proxy/proxy_id.c:1659
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#5 proxy_account_info_handler_send (mem_ctx=<optimized out>, id_ctx=0x55c9a0f048e0, data=<optimized out>, params=0x55c9a0f39790) at src/providers/proxy/proxy_id.c:1758
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#6 0x000055c99fc67677 in file_dp_request (_dp_req=<synthetic pointer>, req=0x55c9a0f39470, request_data=<optimized out>, dp_flags=1, method=DPM_ACCOUNT_HANDLER, target=DPT_ID,
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name=<optimized out>, domainname=0x55c9a0f39190 "LDAP", provider=0x55c9a0efe0e0, mem_ctx=<optimized out>) at src/providers/data_provider/dp_request.c:250
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#7 dp_req_send (mem_ctx=0x55c9a0f37b60, provider=provider@entry=0x55c9a0efe0e0, domain=domain@entry=0x55c9a0f39190 "LDAP", name=<optimized out>, target=target@entry=DPT_ID,
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method=method@entry=DPM_ACCOUNT_HANDLER, dp_flags=dp_flags@entry=1, request_data=0x55c9a0f37c00, _request_name=0x55c9a0f37b60) at src/providers/data_provider/dp_request.c:295
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#8 0x000055c99fc6a132 in dp_get_account_info_send (mem_ctx=<optimized out>, ev=0x55c9a0eddbc0, sbus_req=<optimized out>, provider=0x55c9a0efe0e0, dp_flags=1,
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entry_type=<optimized out>, filter=0x55c9a0f358d0 "name=nobody@ldap", domain=0x55c9a0f39190 "LDAP", extra=0x55c9a0f354a0 "") at src/providers/data_provider/dp_target_id.c:528
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#9 0x00007fb4da35265b in _sbus_sss_invoke_in_uusss_out_qus_step (ev=0x55c9a0eddbc0, te=<optimized out>, tv=..., private_data=<optimized out>) at src/sss_iface/sbus_sss_invokers.c:2847
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#10 0x00007fb4d9cfb1cf in tevent_common_invoke_timer_handler () from /lib64/libtevent.so.0
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#11 0x00007fb4d9cfb339 in tevent_common_loop_timer_delay () from /lib64/libtevent.so.0
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#12 0x00007fb4d9cfc2f9 in epoll_event_loop_once () from /lib64/libtevent.so.0
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#13 0x00007fb4d9cfa7b7 in std_event_loop_once () from /lib64/libtevent.so.0
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#14 0x00007fb4d9cf5b5d in _tevent_loop_once () from /lib64/libtevent.so.0
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#15 0x00007fb4d9cf5d8b in tevent_common_loop_wait () from /lib64/libtevent.so.0
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#16 0x00007fb4d9cfa757 in std_event_loop_wait () from /lib64/libtevent.so.0
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#17 0x00007fb4dd955ac3 in server_loop (main_ctx=0x55c9a0edf090) at src/util/server.c:724
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#18 0x000055c99fc59760 in main (argc=8, argv=<optimized out>) at src/providers/data_provider_be.c:747
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(gdb) l
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(gdb) bt
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#0 0x00007fb4ce4a9ac5 in save_group (sysdb=sysdb@entry=0x55c9a0efb230, dom=dom@entry=0x55c9a0efb420, grp=grp@entry=0x55c9a0f370f0, real_name=0x55c9a0f47340 "nobody@ldap",
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alias=alias@entry=0x0) at src/providers/proxy/proxy_id.c:748
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#1 0x00007fb4ce4aa600 in get_gr_gid (mem_ctx=mem_ctx@entry=0x55c9a0f38be0, sysdb=sysdb@entry=0x55c9a0efb230, dom=dom@entry=0x55c9a0efb420, gid=99, now=<optimized out>,
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ctx=<optimized out>) at src/providers/proxy/proxy_id.c:1160
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#2 0x00007fb4ce4ac9e5 in get_initgr_groups_process (pwd=0x55c9a0f384a0, pwd=0x55c9a0f384a0, dom=0x55c9a0efb420, sysdb=0x55c9a0efb230, ctx=0x55c9a0f048e0, memctx=0x55c9a0f38be0)
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at src/providers/proxy/proxy_id.c:1553
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#3 get_initgr (i_name=<optimized out>, dom=0x55c9a0efb420, sysdb=<optimized out>, ctx=0x55c9a0f048e0, mem_ctx=0x55c9a0f38b70) at src/providers/proxy/proxy_id.c:1461
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#4 proxy_account_info (domain=0x55c9a0efb420, be_ctx=<optimized out>, data=<optimized out>, ctx=0x55c9a0f048e0, mem_ctx=0x55c9a0f38b70) at src/providers/proxy/proxy_id.c:1659
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#5 proxy_account_info_handler_send (mem_ctx=<optimized out>, id_ctx=0x55c9a0f048e0, data=<optimized out>, params=0x55c9a0f39790) at src/providers/proxy/proxy_id.c:1758
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#6 0x000055c99fc67677 in file_dp_request (_dp_req=<synthetic pointer>, req=0x55c9a0f39470, request_data=<optimized out>, dp_flags=1, method=DPM_ACCOUNT_HANDLER, target=DPT_ID,
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name=<optimized out>, domainname=0x55c9a0f39190 "LDAP", provider=0x55c9a0efe0e0, mem_ctx=<optimized out>) at src/providers/data_provider/dp_request.c:250
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#7 dp_req_send (mem_ctx=0x55c9a0f37b60, provider=provider@entry=0x55c9a0efe0e0, domain=domain@entry=0x55c9a0f39190 "LDAP", name=<optimized out>, target=target@entry=DPT_ID,
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method=method@entry=DPM_ACCOUNT_HANDLER, dp_flags=dp_flags@entry=1, request_data=0x55c9a0f37c00, _request_name=0x55c9a0f37b60) at src/providers/data_provider/dp_request.c:295
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#8 0x000055c99fc6a132 in dp_get_account_info_send (mem_ctx=<optimized out>, ev=0x55c9a0eddbc0, sbus_req=<optimized out>, provider=0x55c9a0efe0e0, dp_flags=1,
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entry_type=<optimized out>, filter=0x55c9a0f358d0 "name=nobody@ldap", domain=0x55c9a0f39190 "LDAP", extra=0x55c9a0f354a0 "") at src/providers/data_provider/dp_target_id.c:528
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#9 0x00007fb4da35265b in _sbus_sss_invoke_in_uusss_out_qus_step (ev=0x55c9a0eddbc0, te=<optimized out>, tv=..., private_data=<optimized out>) at src/sss_iface/sbus_sss_invokers.c:2847
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#10 0x00007fb4d9cfb1cf in tevent_common_invoke_timer_handler () from /lib64/libtevent.so.0
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#11 0x00007fb4d9cfb339 in tevent_common_loop_timer_delay () from /lib64/libtevent.so.0
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#12 0x00007fb4d9cfc2f9 in epoll_event_loop_once () from /lib64/libtevent.so.0
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#13 0x00007fb4d9cfa7b7 in std_event_loop_once () from /lib64/libtevent.so.0
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#14 0x00007fb4d9cf5b5d in _tevent_loop_once () from /lib64/libtevent.so.0
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#15 0x00007fb4d9cf5d8b in tevent_common_loop_wait () from /lib64/libtevent.so.0
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#16 0x00007fb4d9cfa757 in std_event_loop_wait () from /lib64/libtevent.so.0
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#17 0x00007fb4dd955ac3 in server_loop (main_ctx=0x55c9a0edf090) at src/util/server.c:724
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#18 0x000055c99fc59760 in main (argc=8, argv=<optimized out>) at src/providers/data_provider_be.c:747
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(gdb) l
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733 ret = remove_duplicate_group_members(tmp_ctx, grp, &ngroup);
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734 if (ret != EOK) {
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735 DEBUG(SSSDBG_CRIT_FAILURE, "Failed to remove duplicate group member s\n");
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736 goto done;
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737 }
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738
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739 DEBUG_GR_MEM(SSSDBG_TRACE_LIBS, ngroup);
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740
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741 ret = sysdb_transaction_start(sysdb);
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742 if (ret != EOK) {
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743 DEBUG(SSSDBG_CRIT_FAILURE, "Failed to start transaction\n");
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744 goto done;
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745 }
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746 in_transaction = true;
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747
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748 if (ngroup->gr_mem && ngroup->gr_mem[0]) {
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749 attrs = sysdb_new_attrs(tmp_ctx);
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750 if (!attrs) {
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751 DEBUG(SSSDBG_CRIT_FAILURE, "Allocation error?!\n");
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752 ret = ENOMEM;
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(gdb) p ngroup
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$1 = (struct group *) 0x0
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743 DEBUG(SSSDBG_CRIT_FAILURE, "Failed to start transaction\n");
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744 goto done;
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745 }
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746 in_transaction = true;
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747
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748 if (ngroup->gr_mem && ngroup->gr_mem[0]) {
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749 attrs = sysdb_new_attrs(tmp_ctx);
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750 if (!attrs) {
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751 DEBUG(SSSDBG_CRIT_FAILURE, "Allocation error?!\n");
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752 ret = ENOMEM;
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(gdb) p ngroup
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$1 = (struct group *) 0x0
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Merges: https://pagure.io/SSSD/sssd/pull-request/4036
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Resolves:
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https://pagure.io/SSSD/sssd/issue/4037
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Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
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(cherry picked from commit e1b678c0cce73494d986610920b03956c1dbb62a)
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---
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src/providers/proxy/proxy_id.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/src/providers/proxy/proxy_id.c b/src/providers/proxy/proxy_id.c
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index e1be29076..91105ce5a 100644
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--- a/src/providers/proxy/proxy_id.c
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+++ b/src/providers/proxy/proxy_id.c
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@@ -698,10 +698,12 @@ static errno_t remove_duplicate_group_members(TALLOC_CTX *mem_ctx,
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}
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grp->gr_mem[i] = NULL;
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- *_grp = talloc_steal(mem_ctx, grp);
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ret = EOK;
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done:
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+ if (ret == EOK) {
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+ *_grp = talloc_steal(mem_ctx, grp);
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+ }
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talloc_zfree(tmp_ctx);
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return ret;
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--
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2.20.1
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