This is a note to let you know that I've just added the patch titled
zram: fix potential UAF of zram table
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
zram-fix-potential-uaf-of-zram-table.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 75182400c908f3406b9b4b2327fcfa032002ee58
Author: Kairui Song <kasong@xxxxxxxxxxx>
Date: Tue Jan 7 14:54:46 2025 +0800
zram: fix potential UAF of zram table
[ Upstream commit 212fe1c0df4a150fb6298db2cfff267ceaba5402 ]
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@xxxxxxxxx
Fixes: 74363ec674cb ("zram: fix uninitialized ZRAM not releasing backing device")
Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 4e008cd0ef655..6da0c98a1016f 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1174,6 +1174,7 @@ 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;
}
