Forwarded: [PATCH] check keys size before checksum calculation

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@xxxxxxxxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx.

***

Subject: [PATCH] check keys size before checksum calculation
Author: subasris1210@xxxxxxxxx

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git ba5cc80fd32665ed609037ff30ede8d194f24aab

Signed-off-by: Subasri S <subasris1210@xxxxxxxxx>
---
 drivers/md/bcache/super.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 97d9adb0bf96..49b3a2231820 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -204,6 +204,11 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
 	if (memcmp(sb->magic, bcache_magic, 16))
 		goto err;
 
+
+	err = "Too many journal buckets";
+	if (sb->keys > SB_JOURNAL_BUCKETS)
+		goto err;
+
 	err = "Bad checksum";
 	if (s->csum != csum_set(s))
 		goto err;
-- 
2.43.0