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From 940aecfcffe12b565ff0e06d1b6c838a86dfbdd0 Mon Sep 17 00:00:00 2001
From: jkar8572 <jkar8572>
Date: Tue, 4 May 2010 12:37:39 +0000
Subject: [PATCH] * avoid memory corruption of NULL address (Petr Pisar)

Petr Pisar: Upstream patch without Changelog lines.

diff --git a/quotasys.c b/quotasys.c
index 8df5e3b..cce5787 100644
--- a/quotasys.c
+++ b/quotasys.c
@@ -746,9 +746,12 @@ void init_kernel_interface(void)
 	kernel_qfmt_num = 0;
 	if (!stat("/proc/fs/xfs/stat", &st))
 		kernel_qfmt[kernel_qfmt_num++] = QF_XFS;
-	else
-		if (!quotactl(QCMD(Q_XGETQSTAT, 0), NULL, 0, NULL) || (errno != EINVAL && errno != ENOSYS))
+	else {
+		fs_quota_stat_t dummy;
+
+		if (!quotactl(QCMD(Q_XGETQSTAT, 0), NULL, 0, (void *)&dummy) || (errno != EINVAL && errno != ENOSYS))
 			kernel_qfmt[kernel_qfmt_num++] = QF_XFS;
+	}
 	/* Detect new kernel interface; Assume generic interface unless we can prove there is not one... */
 	if (!stat("/proc/sys/fs/quota", &st) || errno != ENOENT) {
 		kernel_iface = IFACE_GENERIC;
-- 
1.7.3.2