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pipe: Fix iteration end check in fuse_dev_splice_write()

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Fix the iteration end check in fuse_dev_splice_write().  The iterator
position can only be compared with == or != since wrappage may be involved.

Fixes: 8cefc107ca ("pipe: Use head and tail pointers for the ring, not cursor and length")
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2019-12-06 21:34:51 +00:00 • committed by Linus Torvalds
parent 43a2898631
commit 76f6777c9c
1 changed files with 1 additions and 1 deletions
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2
fs/fuse/dev.c
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@ -1965,7 +1965,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
nbuf = 0; nbuf = 0;
rem = 0; rem = 0;
for (idx = tail; idx < head && rem < len; idx++) for (idx = tail; idx != head && rem < len; idx++)
rem += pipe->bufs[idx & mask].len; rem += pipe->bufs[idx & mask].len;
ret = -EINVAL; ret = -EINVAL;