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Message-Id: <20220607165007.957508534@linuxfoundation.org>
Date: Tue, 7 Jun 2022 19:03:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>,
Ritesh Harjani <ritesh.list@...il.com>,
Theodore Tso <tytso@....edu>
Subject: [PATCH 5.17 641/772] ext4: fix memory leak in parse_apply_sb_mount_options()
From: Eric Biggers <ebiggers@...gle.com>
commit c069db76ed7b681c69159f44be96d2137e9ca989 upstream.
If processing the on-disk mount options fails after any memory was
allocated in the ext4_fs_context, e.g. s_qf_names, then this memory is
leaked. Fix this by calling ext4_fc_free() instead of kfree() directly.
Reproducer:
mkfs.ext4 -F /dev/vdc
tune2fs /dev/vdc -E mount_opts=usrjquota=file
echo clear > /sys/kernel/debug/kmemleak
mount /dev/vdc /vdc
echo scan > /sys/kernel/debug/kmemleak
sleep 5
echo scan > /sys/kernel/debug/kmemleak
cat /sys/kernel/debug/kmemleak
Fixes: 7edfd85b1ffd ("ext4: Completely separate options parsing and sb setup")
Cc: stable@...r.kernel.org
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Tested-by: Ritesh Harjani <ritesh.list@...il.com>
Link: https://lore.kernel.org/r/20220513231605.175121-2-ebiggers@kernel.org
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/ext4/super.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2626,8 +2626,10 @@ parse_failed:
ret = ext4_apply_options(fc, sb);
out_free:
- kfree(s_ctx);
- kfree(fc);
+ if (fc) {
+ ext4_fc_free(fc);
+ kfree(fc);
+ }
kfree(s_mount_opts);
return ret;
}
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