linux-kernel - [PATCH] hv: hypervvssd: call endmntent before call setmntent again

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Date:	Tue, 17 Mar 2015 17:13:19 +0800
From:	Vaughan Cao <vaughan.cao@...cle.com>
To:	vkuznets@...hat.com, devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org
Cc:	kys@...rosoft.com, haiyangz@...rosoft.com
Subject: [PATCH] hv: hypervvssd: call endmntent before call setmntent again

If freeze fails, vss_operate will re-enter itself to thaw. But it forgets
to call endmntent() before it recalls setmntent() again.

Signed-off-by: Vaughan Cao <vaughan.cao@...cle.com>
---
 tools/hv/hv_vss_daemon.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
index 5e63f70..506dd01 100644
--- a/tools/hv/hv_vss_daemon.c
+++ b/tools/hv/hv_vss_daemon.c
@@ -81,6 +81,7 @@ static int vss_operate(int operation)
 	char match[] = "/dev/";
 	FILE *mounts;
 	struct mntent *ent;
+	char errdir[1024] = {0};
 	unsigned int cmd;
 	int error = 0, root_seen = 0, save_errno = 0;
 
@@ -115,6 +116,8 @@ static int vss_operate(int operation)
 			goto err;
 	}
 
+	endmntent(mounts);
+
 	if (root_seen) {
 		error |= vss_do_freeze("/", cmd);
 		if (error && operation == VSS_OP_FREEZE)
@@ -124,16 +127,19 @@ static int vss_operate(int operation)
 	goto out;
 err:
 	save_errno = errno;
+	if (ent) {
+		strncpy(errdir, ent->mnt_dir, sizeof(errdir)-1);
+		endmntent(mounts);
+	}
 	vss_operate(VSS_OP_THAW);
 	/* Call syslog after we thaw all filesystems */
 	if (ent)
 		syslog(LOG_ERR, "FREEZE of %s failed; error:%d %s",
-		       ent->mnt_dir, save_errno, strerror(save_errno));
+		       errdir, save_errno, strerror(save_errno));
 	else
 		syslog(LOG_ERR, "FREEZE of / failed; error:%d %s", save_errno,
 		       strerror(save_errno));
 out:
-	endmntent(mounts);
 	return error;
 }
 
-- 
1.9.0

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