From: Hou Tao <houtao1@huawei.com>
Date: Tue, 17 Oct 2017 03:20:45 +0000 (+0800)
Subject: log-writes: fix possible infinite loop in zero_range()
X-Git-Tag: v2022.05.01~1818
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=14b71ba4db49278b87b1dbe656a1a615d0066084;p=xfstests-dev.git

log-writes: fix possible infinite loop in zero_range()

Found it when trying to remove the limitation of log->max_zero_size.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
---

diff --git a/src/log-writes/log-writes.c b/src/log-writes/log-writes.c
index fab447a8..09391574 100644
--- a/src/log-writes/log-writes.c
+++ b/src/log-writes/log-writes.c
@@ -65,6 +65,9 @@ static int zero_range(struct log *log, u64 start, u64 len)
 
 	memset(buf, 0, bufsize);
 	while (len) {
+		if (len < bufsize)
+			bufsize = len;
+
 		ret = pwrite(log->replayfd, buf, bufsize, start);
 		if (ret != bufsize) {
 			fprintf(stderr, "Error zeroing file: %d\n", errno);