Re: [Linux-kernel-mentees] [PATCH] udf: Fix memory leak in udf_process_sequence()
From: Jan Kara <jack@suse.cz>
Date: 2020-09-23 10:04:09
Also in:
lkml
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 <redacted>Thanks for the patch but I've just yesterday written exactly the same patch and merged it to my tree... Honza
quoted hunk ↗ jump to hunk
--- 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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