Messages in this thread Patch in this message | | | From | Al Viro <> | Subject | [PATCH 04/18] csum_and_copy_..._user(): pass 0xffffffff instead of 0 as initial sum | Date | Tue, 21 Jul 2020 21:25:35 +0100 |
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From: Al Viro <viro@zeniv.linux.org.uk>
Preparation for the change of calling conventions; right now all callers pass 0 as initial sum. Passing 0xffffffff instead yields the values comparable mod 0xffff and guarantees that 0 will not be returned on success.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- lib/iov_iter.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 7405922caaec..d5b7e204fea6 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1451,7 +1451,7 @@ size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, int err = 0; next = csum_and_copy_from_user(v.iov_base, (to += v.iov_len) - v.iov_len, - v.iov_len, 0, &err); + v.iov_len, ~0U, &err); if (!err) { sum = csum_block_add(sum, next, off); off += v.iov_len; @@ -1493,7 +1493,7 @@ bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, int err = 0; next = csum_and_copy_from_user(v.iov_base, (to += v.iov_len) - v.iov_len, - v.iov_len, 0, &err); + v.iov_len, ~0U, &err); if (err) return false; sum = csum_block_add(sum, next, off); @@ -1539,7 +1539,7 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump, int err = 0; next = csum_and_copy_to_user((from += v.iov_len) - v.iov_len, v.iov_base, - v.iov_len, 0, &err); + v.iov_len, ~0U, &err); if (!err) { sum = csum_block_add(sum, next, off); off += v.iov_len; -- 2.11.0
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