* [Linux-kernel-mentees] [PATCH] udf: Fix memory leak in udf_process_sequence()
[not found] <0000000000004c1f4d05afcff2f4@google.com>
@ 2020-09-22 15:45 ` Peilin Ye
2020-09-23 10:04 ` Jan Kara
0 siblings, 1 reply; 3+ messages in thread
From: Peilin Ye @ 2020-09-22 15:45 UTC (permalink / raw)
To: Jan Kara; +Cc: syzkaller-bugs, linux-kernel-mentees, Peilin Ye, linux-kernel
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>
---
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
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^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Linux-kernel-mentees] [PATCH] udf: Fix memory leak in udf_process_sequence()
2020-09-22 15:45 ` [Linux-kernel-mentees] [PATCH] udf: Fix memory leak in udf_process_sequence() Peilin Ye
@ 2020-09-23 10:04 ` Jan Kara
2020-09-23 10:29 ` Peilin Ye
0 siblings, 1 reply; 3+ messages in thread
From: Jan Kara @ 2020-09-23 10:04 UTC (permalink / raw)
To: Peilin Ye; +Cc: syzkaller-bugs, linux-kernel-mentees, linux-kernel, Jan Kara
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
_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Linux-kernel-mentees] [PATCH] udf: Fix memory leak in udf_process_sequence()
2020-09-23 10:04 ` Jan Kara
@ 2020-09-23 10:29 ` Peilin Ye
0 siblings, 0 replies; 3+ messages in thread
From: Peilin Ye @ 2020-09-23 10:29 UTC (permalink / raw)
To: Jan Kara; +Cc: syzkaller-bugs, linux-kernel-mentees, linux-kernel, Jan Kara
Hi,
On Wed, Sep 23, 2020 at 12:04:05PM +0200, Jan Kara wrote:
> 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...
Ah, no worries, happy to see the bug gets fixed!
Peilin Ye
_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-09-22 15:45 ` [Linux-kernel-mentees] [PATCH] udf: Fix memory leak in udf_process_sequence() Peilin Ye
2020-09-23 10:04 ` Jan Kara
2020-09-23 10:29 ` Peilin Ye
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