linux-kernel - [PATCH v2] s390/mm: Fix memory leak in add

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251027150838.59571-1-linmq006@gmail.com>
Date: Mon, 27 Oct 2025 23:08:38 +0800
From: Miaoqian Lin <linmq006@...il.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Cc: linmq006@...il.com,
	stable@...r.kernel.org
Subject: [PATCH v2] s390/mm: Fix memory leak in add_marker() when kvrealloc fails

The function has a memory leak when kvrealloc() fails.
The function directly assigns NULL to the markers pointer, losing the
reference to the previously allocated memory. This causes kvfree() in
pt_dump_init() to free NULL instead of the leaked memory.

Fix by:
1. Using kvrealloc() uniformly for all allocations
2. Using a temporary variable to preserve the original pointer until
   allocation succeeds
3. Removing the error path that sets markers_cnt=0 to keep
   consistency between markers and markers_cnt

Found via static analysis and this is similar to commit 42378a9ca553
("bpf, verifier: Fix memory leak in array reallocation for stack state")

Fixes: d0e7915d2ad3 ("s390/mm/ptdump: Generate address marker array dynamically")
Cc: stable@...r.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
changes in v2:
- update the fixing logic to prevent memory leak in v1
v1 link: https://lore.kernel.org/all/20251026091351.36275-1-linmq006@gmail.com/
---
 arch/s390/mm/dump_pagetables.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index 9af2aae0a515..ab0c1fcf2782 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -291,16 +291,15 @@ static int ptdump_cmp(const void *a, const void *b)
 
 static int add_marker(unsigned long start, unsigned long end, const char *name)
 {
-	size_t oldsize, newsize;
-
-	oldsize = markers_cnt * sizeof(*markers);
-	newsize = oldsize + 2 * sizeof(*markers);
-	if (!oldsize)
-		markers = kvmalloc(newsize, GFP_KERNEL);
-	else
-		markers = kvrealloc(markers, newsize, GFP_KERNEL);
-	if (!markers)
-		goto error;
+	struct addr_marker *new_markers;
+	size_t newsize;
+
+	newsize = (markers_cnt + 2) * sizeof(*markers);
+	new_markers = kvrealloc(markers, newsize, GFP_KERNEL);
+	if (!new_markers)
+		return -ENOMEM;
+
+	markers = new_markers;
 	markers[markers_cnt].is_start = 1;
 	markers[markers_cnt].start_address = start;
 	markers[markers_cnt].size = end - start;
@@ -312,9 +311,6 @@ static int add_marker(unsigned long start, unsigned long end, const char *name)
 	markers[markers_cnt].name = name;
 	markers_cnt++;
 	return 0;
-error:
-	markers_cnt = 0;
-	return -ENOMEM;
 }
 
 static int pt_dump_init(void)
-- 
2.39.5 (Apple Git-154)