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authorAl Viro <viro@zeniv.linux.org.uk>2022-06-11 16:44:21 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2022-07-06 16:27:17 -0400
commit7392ed1734c319150b5ddec3f192a6405728e8d0 (patch)
treea611a08e4d20f75cb152b750ada69fedb4db2ac1 /lib/iov_iter.c
parent18fa9af7263164ec9a8d7b28a848324825f14672 (diff)
iov_iter_get_pages{,_alloc}(): cap the maxsize with MAX_RW_COUNT
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 <jlayton@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'lib/iov_iter.c')
-rw-r--r--lib/iov_iter.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index c51314639615..225b968ed8c5 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -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;