+ selftests-mm-mlock2-tests-fix-fclosenull-in-is_vmflag_set.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: selftests/mm: mlock2-tests: fix fclose(NULL) in is_vmflag_set()
has been added to the -mm mm-new branch.  Its filename is
     selftests-mm-mlock2-tests-fix-fclosenull-in-is_vmflag_set.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-mlock2-tests-fix-fclosenull-in-is_vmflag_set.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Hongfu Li <lihongfu@kylinos.cn>
Subject: selftests/mm: mlock2-tests: fix fclose(NULL) in is_vmflag_set()
Date: Wed, 04 Nov 2026 16:49:10 +0800

is_vmflag_set() jumps to the shared 'out' label when seek_to_smaps_entry()
fails.  smaps is NULL on that path, and the code at the 'out' label calls
fclose(smaps) unconditionally.  fclose(NULL) is undefined behaviour, so
the test crashes before it can report a test result.

Link: https://lore.kernel.org/20261104-for-mlock2-v1-1-57e6dd74c2bd@kylinos.cn
Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Shuah Khan <shuah@kernel.org>
---

 tools/testing/selftests/mm/mlock2-tests.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/mm/mlock2-tests.c~selftests-mm-mlock2-tests-fix-fclosenull-in-is_vmflag_set
+++ a/tools/testing/selftests/mm/mlock2-tests.c
@@ -66,7 +66,7 @@ static bool is_vmflag_set(unsigned long
 	smaps = seek_to_smaps_entry(addr);
 	if (!smaps) {
 		ksft_print_msg("Unable to parse /proc/self/smaps\n");
-		goto out;
+		return false;
 	}
 
 	while (getline(&line, &size, smaps) > 0) {
_

Patches currently in -mm which might be from lihongfu@kylinos.cn are

selftests-mm-mlock2-tests-fix-fclosenull-in-is_vmflag_set.patch