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From 780f79420073e0c09cd41afea28ac217a6d4ef29 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Fri, 26 Jun 2020 12:59:32 +0200
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Subject: [PATCH 49/55] libmount: (parser) fix memory leak on error before
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end-of-file
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Let's simplify the loop where we add FS to the table. The optimization
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for recoverable errors is a fragile overkill. The new code always
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allocates and unrefs FS for each loop.
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Addresses: https://github.com/karelzak/util-linux/pull/1068
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1900498
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Upstream: http://github.com/karelzak/util-linux/commit/fe0d12d4f82269096f8d0cffc51ca9590814c284
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libmount/src/fs.c | 2 +-
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libmount/src/tab_parse.c | 49 ++++++++++++++++++++++------------------
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2 files changed, 28 insertions(+), 23 deletions(-)
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diff --git a/libmount/src/fs.c b/libmount/src/fs.c
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index def32253c..aae4961c3 100644
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--- a/libmount/src/fs.c
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+++ b/libmount/src/fs.c
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@@ -34,7 +34,7 @@ struct libmnt_fs *mnt_new_fs(void)
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fs->refcount = 1;
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INIT_LIST_HEAD(&fs->ents);
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- /*DBG(FS, ul_debugobj(fs, "alloc"));*/
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+ DBG(FS, ul_debugobj(fs, "alloc"));
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return fs;
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}
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diff --git a/libmount/src/tab_parse.c b/libmount/src/tab_parse.c
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index 10fc68279..719c1abca 100644
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--- a/libmount/src/tab_parse.c
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+++ b/libmount/src/tab_parse.c
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@@ -608,7 +608,6 @@ static int __table_parse_stream(struct libmnt_table *tb, FILE *f, const char *fi
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int rc = -1;
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int flags = 0;
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pid_t tid = -1;
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- struct libmnt_fs *fs = NULL;
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struct libmnt_parser pa = { .line = 0 };
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assert(tb);
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@@ -628,19 +627,25 @@ static int __table_parse_stream(struct libmnt_table *tb, FILE *f, const char *fi
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if (filename && strcmp(filename, _PATH_PROC_MOUNTS) == 0)
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flags = MNT_FS_KERNEL;
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- while (!feof(f)) {
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- if (!fs) {
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- fs = mnt_new_fs();
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- if (!fs)
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- goto err;
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+ do {
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+ struct libmnt_fs *fs;
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+
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+ if (feof(f)) {
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+ DBG(TAB, ul_debugobj(tb, "end-of-file"));
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+ break;
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}
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+ fs = mnt_new_fs();
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+ if (!fs)
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+ goto err;
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+ /* parse */
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rc = mnt_table_parse_next(&pa, tb, fs);
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- if (!rc && tb->fltrcb && tb->fltrcb(fs, tb->fltrcb_data))
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- rc = 1; /* filtered out by callback... */
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+ if (rc != 0 && tb->fltrcb && tb->fltrcb(fs, tb->fltrcb_data))
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+ rc = 1; /* error filtered out by callback... */
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- if (!rc) {
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+ /* add to the table */
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+ if (rc == 0) {
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rc = mnt_table_add_fs(tb, fs);
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fs->flags |= flags;
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@@ -651,21 +656,21 @@ static int __table_parse_stream(struct libmnt_table *tb, FILE *f, const char *fi
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}
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}
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- if (rc) {
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- if (rc > 0) {
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- mnt_reset_fs(fs);
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- assert(fs->refcount == 1);
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- continue; /* recoverable error, reuse fs*/
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- }
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+ /* remove refernece (or deallocate on error) */
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+ mnt_unref_fs(fs);
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- mnt_unref_fs(fs);
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- if (feof(f))
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- break;
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- goto err; /* fatal error */
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+ /* recoverable error */
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+ if (rc > 0) {
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+ DBG(TAB, ul_debugobj(tb, "recoverable error (continue)"));
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+ continue;
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}
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- mnt_unref_fs(fs);
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- fs = NULL;
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- }
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+
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+ /* fatal errors */
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+ if (rc < 0 && !feof(f)) {
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+ DBG(TAB, ul_debugobj(tb, "fatal error"));
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+ goto err;
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+ }
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+ } while (1);
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DBG(TAB, ul_debugobj(tb, "%s: stop parsing (%d entries)",
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filename, mnt_table_get_nents(tb)));
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--
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2.29.2
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