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Bug fixes for 6.6-rc6:

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* Fix a bug where a writev consisting of a bunch of sub-fsblock writes
   where the last buffer address is invalid could lead to an infinite
   loop.
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'iomap-6.6-fixes-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull iomap fix from Darrick Wong:

 - Fix a bug where a writev consisting of a bunch of sub-fsblock writes
   where the last buffer address is invalid could lead to an infinite
   loop

* tag 'iomap-6.6-fixes-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: fix short copy in iomap_write_iter()
This commit is contained in:
Linus Torvalds 2023-10-21 09:43:09 -07:00
parent 9c5d00cb7b 3ac974796e
commit 5722119f67
1 changed files with 7 additions and 3 deletions
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10
fs/iomap/buffered-io.c
View file

@ -881,8 +881,10 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
size_t bytes; /* Bytes to write to folio */
size_t copied; /* Bytes copied from user */
bytes = iov_iter_count(i);
retry:
offset = pos & (chunk - 1);
bytes = min(chunk - offset, iov_iter_count(i));
bytes = min(chunk - offset, bytes);
status = balance_dirty_pages_ratelimited_flags(mapping,
bdp_flags);
if (unlikely(status))
@ -933,10 +935,12 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
* halfway through, might be a race with munmap,
* might be severe memory pressure.
*/
if (copied)
bytes = copied;
if (chunk > PAGE_SIZE)
chunk /= 2;
if (copied) {
bytes = copied;
goto retry;
}
} else {
pos += status;
written += status;