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autofs-5.1.8 - fix use after free in tree_mapent_delete_offset_tree()
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From: Ian Kent <raven@themaw.net>
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The key field of the map entry of the root of the map entry tree to be
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deleted can't be used for the key parameter, fix it.
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Signed-off-by: Ian Kent <raven@themaw.net>
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---
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CHANGELOG | 1 +
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lib/mounts.c | 16 +++++++++++++---
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2 files changed, 14 insertions(+), 3 deletions(-)
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--- autofs-5.1.4.orig/CHANGELOG
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+++ autofs-5.1.4/CHANGELOG
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@@ -88,6 +88,7 @@
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- dont fail on duplicate offset entry tree add.
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- fix loop under run in cache_get_offset_parent().
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- simplify cache_add() a little.
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+- fix use after free in tree_mapent_delete_offset_tree().
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xx/xx/2018 autofs-5.1.5
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- fix flag file permission.
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--- autofs-5.1.4.orig/lib/mounts.c
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+++ autofs-5.1.4/lib/mounts.c
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@@ -1666,16 +1666,26 @@ static int tree_mapent_delete_offset_tre
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*/
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if (MAPENT_ROOT(me) != MAPENT_NODE(me)) {
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struct tree_node *root = MAPENT_ROOT(me);
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+ char *key;
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- debug(logopt, "deleting offset key %s", me->key);
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+ key = strdup(me->key);
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+ if (!key) {
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+ char buf[MAX_ERR_BUF];
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+ char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
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+ error(logopt, "strdup: %s", estr);
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+ return 0;
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+ }
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+
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+ debug(logopt, "deleting offset key %s", key);
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/* cache_delete won't delete an active offset */
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MAPENT_SET_ROOT(me, NULL);
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- ret = cache_delete(me->mc, me->key);
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+ ret = cache_delete(me->mc, key);
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if (ret != CHE_OK) {
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MAPENT_SET_ROOT(me, root);
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- warn(logopt, "failed to delete offset %s", me->key);
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+ warn(logopt, "failed to delete offset %s", key);
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}
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+ free(key);
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} else {
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MAPENT_SET_ROOT(me, NULL);
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MAPENT_SET_PARENT(me, NULL);
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