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* [glibc/release/2.35/master] elf: Fix memory leak in _dl_find_object_update (bug 29062)
@ 2022-04-13 14:10 Florian Weimer
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From: Florian Weimer @ 2022-04-13 14:10 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cc9a4a664faac44fe62b6300b878cf5be514658b
commit cc9a4a664faac44fe62b6300b878cf5be514658b
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed Apr 13 14:18:28 2022 +0200
elf: Fix memory leak in _dl_find_object_update (bug 29062)
The count can be zero if an object has already been loaded as
an indirect dependency (so that l_searchlist.r_list in its link
map is still NULL) is promoted to global scope via RTLD_GLOBAL.
Fixes commit 5d28a8962dc ("elf: Add _dl_find_object function").
(cherry picked from commit 4a41fc3cd9cea9223ea4f13f9c766a1e149a0ccc)
Diff:
---
NEWS | 1 +
elf/dl-find_object.c | 5 +++--
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/NEWS b/NEWS
index cc64dbf58f..728670db02 100644
--- a/NEWS
+++ b/NEWS
@@ -21,6 +21,7 @@ The following bugs are resolved with this release:
[28896] strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-rtm
variants when avoiding overflow
[28953] nss: Protect against errno changes in function lookup
+ [29062] elf: Fix memory leak in _dl_find_object_update
\f
Version 2.35
diff --git a/elf/dl-find_object.c b/elf/dl-find_object.c
index 2b8df2fd67..4d5831b6f4 100644
--- a/elf/dl-find_object.c
+++ b/elf/dl-find_object.c
@@ -788,6 +788,9 @@ _dl_find_object_update (struct link_map *new_map)
for (struct link_map *l = new_map; l != NULL; l = l->l_next)
/* Skip proxy maps and already-processed maps. */
count += l == l->l_real && !l->l_find_object_processed;
+ if (count == 0)
+ return true;
+
struct link_map **map_array = malloc (count * sizeof (*map_array));
if (map_array == NULL)
return false;
@@ -797,8 +800,6 @@ _dl_find_object_update (struct link_map *new_map)
if (l == l->l_real && !l->l_find_object_processed)
map_array[i++] = l;
}
- if (count == 0)
- return true;
_dl_find_object_link_map_sort (map_array, count);
bool ok = _dl_find_object_update_1 (map_array, count);
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2022-04-13 14:10 [glibc/release/2.35/master] elf: Fix memory leak in _dl_find_object_update (bug 29062) Florian Weimer
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