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copy_page_to_iter(): fix ITER_DISCARD case 

commit a506abc7b644d71966a75337d5a534f531b3cdc4 upstream.

we need to advance the iterator...

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2021-04-27 12:34:04 -04:00 committed by Greg Kroah-Hartman
parent c4868118fa
commit 846ae1d879
1 changed files with 5 additions and 2 deletions
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7
lib/iov_iter.c
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@ -896,9 +896,12 @@ size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
size_t wanted = copy_to_iter(kaddr + offset, bytes, i);
kunmap_atomic(kaddr);
return wanted;
} else if (unlikely(iov_iter_is_discard(i)))
} else if (unlikely(iov_iter_is_discard(i))) {
if (unlikely(i->count < bytes))
bytes = i->count;
i->count -= bytes;
return bytes;
else if (likely(!iov_iter_is_pipe(i)))
} else if (likely(!iov_iter_is_pipe(i)))
return copy_page_to_iter_iovec(page, offset, bytes, i);
else
return copy_page_to_iter_pipe(page, offset, bytes, i);