From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 29 Apr 2017 20:42:30 +0000 (-0400)
Subject: fix a braino in ITER_PIPE iov_iter_revert()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4fa55cefee1bbecadb4c9f47d40a92f65dc44351;p=openwrt%2Fstaging%2Fblogic.git

fix a braino in ITER_PIPE iov_iter_revert()

Fixes: 27c0e3748e41
Tested-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 60abc44385b7..cc001a542cb5 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -798,7 +798,7 @@ void iov_iter_revert(struct iov_iter *i, size_t unroll)
 		while (1) {
 			size_t n = off - pipe->bufs[idx].offset;
 			if (unroll < n) {
-				off -= (n - unroll);
+				off -= unroll;
 				break;
 			}
 			unroll -= n;