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SubjectRe: [Linux-kernel-mentees] [PATCH] udf: Fix memory leak in udf_process_sequence()
On Tue 22-09-20 11:45:31, Peilin Ye wrote:
> udf_process_sequence() is leaking memory. Free `data.part_descs_loc`
> before returning.
>
> Cc: stable@vger.kernel.org
> Fixes: 7b78fd02fb19 ("udf: Fix handling of Partition Descriptors")
> Reported-and-tested-by: syzbot+128f4dd6e796c98b3760@syzkaller.appspotmail.com
> Link: https://syzkaller.appspot.com/bug?id=c5ec4e6f5d818f3c4afd4d59342468eec08a38da
> Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>

Thanks for the patch but I've just yesterday written exactly the same patch
and merged it to my tree...

Honza

> ---
> fs/udf/super.c | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/fs/udf/super.c b/fs/udf/super.c
> index 1c42f544096d..b0d862ab3024 100644
> --- a/fs/udf/super.c
> +++ b/fs/udf/super.c
> @@ -1698,7 +1698,8 @@ static noinline int udf_process_sequence(
> "Pointers (max %u supported)\n",
> UDF_MAX_TD_NESTING);
> brelse(bh);
> - return -EIO;
> + ret = -EIO;
> + goto out;
> }
>
> vdp = (struct volDescPtr *)bh->b_data;
> @@ -1718,7 +1719,8 @@ static noinline int udf_process_sequence(
> curr = get_volume_descriptor_record(ident, bh, &data);
> if (IS_ERR(curr)) {
> brelse(bh);
> - return PTR_ERR(curr);
> + ret = PTR_ERR(curr);
> + goto out;
> }
> /* Descriptor we don't care about? */
> if (!curr)
> @@ -1740,28 +1742,32 @@ static noinline int udf_process_sequence(
> */
> if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
> udf_err(sb, "Primary Volume Descriptor not found!\n");
> - return -EAGAIN;
> + ret = -EAGAIN;
> + goto out;
> }
> ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
> if (ret < 0)
> - return ret;
> + goto out;
>
> if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
> ret = udf_load_logicalvol(sb,
> data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
> fileset);
> if (ret < 0)
> - return ret;
> + goto out;
> }
>
> /* Now handle prevailing Partition Descriptors */
> for (i = 0; i < data.num_part_descs; i++) {
> ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
> if (ret < 0)
> - return ret;
> + goto out;
> }
>
> - return 0;
> + ret = 0;
> +out:
> + kfree(data.part_descs_loc);
> + return ret;
> }
>
> /*
> --
> 2.25.1
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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