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ext4: fix off-by-in in loop termination in ext4_find_unwritten_pgoff()

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There is an off-by-one error in loop termination conditions in
ext4_find_unwritten_pgoff() since 'end' may index a page beyond end of
desired range if 'endoff' is page aligned. It doesn't have any visible
effects but still it is good to fix it.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2017-05-21 22:34:23 -04:00 committed by Theodore Ts'o
parent 7d95eddf31
commit 3f1d5bad3f
1 changed files with 1 additions and 1 deletions
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fs/ext4/file.c
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@ -474,7 +474,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
endoff = (loff_t)end_blk << blkbits;
index = startoff >> PAGE_SHIFT;
end = endoff >> PAGE_SHIFT;
end = (endoff - 1) >> PAGE_SHIFT;
pagevec_init(&pvec, 0);
do {