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iov_iter_get_pages{,_alloc}(): cap the maxsize with MAX_RW_COUNT

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All callers can and should handle iov_iter_get_pages() returning
fewer pages than requested.  All in-kernel ones do.  And it makes
the arithmetical overflow analysis much simpler...

Reviewed-by: Jeff Layton <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro committed 2022-07-06 16:27:17 -04:00
1 parent 18fa9af726
commit 7392ed1734
1 file changed
+4
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lib/iov_iter.c
+4
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@@ -1348,6 +1348,8 @@ ssize_t iov_iter_get_pages(struct iov_iter *i,
maxsize = i->count;
if (!maxsize)
return 0;
if (maxsize > MAX_RW_COUNT)
maxsize = MAX_RW_COUNT;
if (likely(iter_is_iovec(i))) {
unsigned int gup_flags = 0;
@@ -1474,6 +1476,8 @@ ssize_t iov_iter_get_pages_alloc(struct iov_iter *i,
maxsize = i->count;
if (!maxsize)
return 0;
if (maxsize > MAX_RW_COUNT)
maxsize = MAX_RW_COUNT;
if (likely(iter_is_iovec(i))) {
unsigned int gup_flags = 0;