diff options
| author | Kairui Song <kasong@tencent.com> | 2025-01-07 07:54:46 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-01-13 04:03:37 +0100 |
| commit | 212fe1c0df4a150fb6298db2cfff267ceaba5402 (patch) | |
| tree | ede7fb9e7142bab77a0481f45304244462af815e /drivers/block | |
| parent | selftests/mm: set allocated memory to non-zero content in cow test (diff) | |
| download | linux-212fe1c0df4a150fb6298db2cfff267ceaba5402.tar.xz linux-212fe1c0df4a150fb6298db2cfff267ceaba5402.zip | |
zram: fix potential UAF of zram table
If zram_meta_alloc failed early, it frees allocated zram->table without
setting it NULL. Which will potentially cause zram_meta_free to access
the table if user reset an failed and uninitialized device.
Link: https://lkml.kernel.org/r/20250107065446.86928-1-ryncsn@gmail.com
Fixes: 74363ec674cb ("zram: fix uninitialized ZRAM not releasing backing device")
Signed-off-by: Kairui Song <kasong@tencent.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 45df5eeabc5e..7903a4da40ac 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1468,6 +1468,7 @@ static bool zram_meta_alloc(struct zram *zram, u64 disksize) zram->mem_pool = zs_create_pool(zram->disk->disk_name); if (!zram->mem_pool) { vfree(zram->table); + zram->table = NULL; return false; } |