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ITER_XARRAY get_pages fix; now the return value is a lot saner 

(and more similar to logics for other flavours)
 
 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull iov_iter fix from Al Viro:
 "ITER_XARRAY get_pages fix; now the return value is a lot saner (and
  more similar to logics for other flavours)"

* tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  iov_iter: Fix iter_xarray_get_pages{,_alloc}()
This commit is contained in:
Linus Torvalds 2022-06-10 15:53:09 -07:00
parent a32e7ea362 6c77676645
commit b098915985
1 changed files with 4 additions and 16 deletions
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20
lib/iov_iter.c
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@ -1434,7 +1434,7 @@ static ssize_t iter_xarray_get_pages(struct iov_iter *i,
{
unsigned nr, offset;
pgoff_t index, count;
size_t size = maxsize, actual;
size_t size = maxsize;
loff_t pos;
if (!size || !maxpages)
@ -1461,13 +1461,7 @@ static ssize_t iter_xarray_get_pages(struct iov_iter *i,
if (nr == 0)
return 0;
actual = PAGE_SIZE * nr;
actual -= offset;
if (nr == count && size > 0) {
unsigned last_offset = (nr > 1) ? 0 : offset;
actual -= PAGE_SIZE - (last_offset + size);
}
return actual;
return min(nr * PAGE_SIZE - offset, maxsize);
}
/* must be done on non-empty ITER_IOVEC one */
@ -1602,7 +1596,7 @@ static ssize_t iter_xarray_get_pages_alloc(struct iov_iter *i,
struct page **p;
unsigned nr, offset;
pgoff_t index, count;
size_t size = maxsize, actual;
size_t size = maxsize;
loff_t pos;
if (!size)
@ -1631,13 +1625,7 @@ static ssize_t iter_xarray_get_pages_alloc(struct iov_iter *i,
if (nr == 0)
return 0;
actual = PAGE_SIZE * nr;
actual -= offset;
if (nr == count && size > 0) {
unsigned last_offset = (nr > 1) ? 0 : offset;
actual -= PAGE_SIZE - (last_offset + size);
}
return actual;
return min(nr * PAGE_SIZE - offset, maxsize);
}
ssize_t iov_iter_get_pages_alloc(struct iov_iter *i,