[merged mm-hotfixes-stable] selftests-mm-fix-potential-wild-pointer-access-of-getline-due-to-missing-init.patch removed from -mm tree

[merged mm-hotfixes-stable] selftests-mm-fix-potential-wild-pointer-access-of-getline-due-to-missing-init.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: selftests/mm: fix potential wild pointer access of getline due to missing init
has been removed from the -mm tree.  Its filename was
     selftests-mm-fix-potential-wild-pointer-access-of-getline-due-to-missing-init.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Chris Gellermann <christian.gellermann@codasip.com>
Subject: selftests/mm: fix potential wild pointer access of getline due to missing init
Date: Wed, 22 Jul 2026 15:02:46 +0200

This is another occurrence of using getline where the code assumes that
getline allocates memory to store the line, but the pointer passed to it
is uninitialized and potentially a non-null pointer.  This violates the
Open Group Spec[1] and caused a segfault in a similar situation in
selftest/clone3/clone3_set_tid.  Fix it by initializing the line pointer
to NULL.

The issue has been found by simply grepping through the selftest code
after running into the issue in clone3_set_tid.  Whether it segfaults in
its current state is unknown to me.  But it's good to be addressed due to
defensive reasons.

Link: https://lore.kernel.org/20260722130246.2135563-3-christian.gellermann@codasip.com
Link: https://pubs.opengroup.org/onlinepubs/9799919799/functions/getline.html [1]
Fixes: 26b4224d9961 ("selftests: expanding more mlock selftest")
Signed-off-by: Chris Gellermann <christian.gellermann@codasip.com>
Acked-by: David Hildenbrand (arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/mlock-random-test.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/mm/mlock-random-test.c~selftests-mm-fix-potential-wild-pointer-access-of-getline-due-to-missing-init
+++ a/tools/testing/selftests/mm/mlock-random-test.c
@@ -84,7 +84,7 @@ int get_proc_locked_vm_size(void)
 int get_proc_page_size(unsigned long addr)
 {
 	FILE *smaps;
-	char *line;
+	char *line = NULL;
 	unsigned long mmupage_size = 0;
 	size_t size;
 
_

Patches currently in -mm which might be from christian.gellermann@codasip.com are