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udf: Fix crash on IO error during truncate

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When truncate(2) hits IO error when reading indirect extent block the
code just bugs with:

kernel BUG at linux-4.15.0/fs/udf/truncate.c:249!
...

Fix the problem by bailing out cleanly in case of IO error.

CC: stable@vger.kernel.org
Reported-by: jean-luc malet <jeanluc.malet@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2019-03-11 15:04:18 +01:00
parent 9e98c678c2
commit d3ca4651d0
1 changed files with 3 additions and 0 deletions
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3
fs/udf/truncate.c
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@ -260,6 +260,9 @@ void udf_truncate_extents(struct inode *inode)
epos.block = eloc;
epos.bh = udf_tread(sb,
udf_get_lb_pblock(sb, &eloc, 0));
/* Error reading indirect block? */
if (!epos.bh)
return;
if (elen)
indirect_ext_len =
(elen + sb->s_blocksize - 1) >>