This is a note to let you know that I've just added the patch titled
quota: Fix memory leak when handling corrupted quota file
to the 5.4-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:
quota-fix-memory-leak-when-handling-corrupted-quota-.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 263b017403c8e67e03009d4edebf792b6d2f1b9a
Author: Jan Kara <jack@xxxxxxx>
Date: Tue Dec 22 12:09:53 2020 +0100
quota: Fix memory leak when handling corrupted quota file
[ Upstream commit a4db1072e1a3bd7a8d9c356e1902b13ac5deb8ef ]
When checking corrupted quota file we can bail out and leak allocated
info structure. Properly free info structure on error return.
Reported-by: syzbot+77779c9b52ab78154b08@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 11c514a99bb9 ("quota: Sanity-check quota file headers on load")
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index 36dce17b01016..56aedf4ba8864 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -166,19 +166,24 @@ static int v2_read_file_info(struct super_block *sb, int type)
quota_error(sb, "Number of blocks too big for quota file size (%llu > %llu).",
(loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits,
i_size_read(sb_dqopt(sb)->files[type]));
- goto out;
+ goto out_free;
}
if (qinfo->dqi_free_blk >= qinfo->dqi_blocks) {
quota_error(sb, "Free block number too big (%u >= %u).",
qinfo->dqi_free_blk, qinfo->dqi_blocks);
- goto out;
+ goto out_free;
}
if (qinfo->dqi_free_entry >= qinfo->dqi_blocks) {
quota_error(sb, "Block with free entry too big (%u >= %u).",
qinfo->dqi_free_entry, qinfo->dqi_blocks);
- goto out;
+ goto out_free;
}
ret = 0;
+out_free:
+ if (ret) {
+ kfree(info->dqi_priv);
+ info->dqi_priv = NULL;
+ }
out:
up_read(&dqopt->dqio_sem);
return ret;
