4.4-stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara jack@suse.cz
commit d3ca4651d05c0ff7259d087d8c949bcf3e14fb46 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/udf/truncate.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/udf/truncate.c +++ b/fs/udf/truncate.c @@ -260,6 +260,9 @@ void udf_truncate_extents(struct 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) >>