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zram: fix potential UAF of zram table

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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: 74363ec674 ("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>
This commit is contained in:
Kairui Song 2025-01-07 14:54:46 +08:00 committed by Andrew Morton
parent a32bf5bb79
commit 212fe1c0df
1 changed files with 1 additions and 0 deletions
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drivers/block/zram/zram_drv.c
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@ -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;
}