File 0230-Increase-buffer-for-sysfs-path.patch of Package mdadm

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File 0230-Increase-buffer-for-sysfs-path.patch of Package mdadm

From bbb52f2b1dd049a15323d7bccde50e5818abd175 Mon Sep 17 00:00:00 2001
From: Tomasz Majchrzak <tomasz.majchrzak@intel.com>
Date: Fri, 28 Oct 2016 10:35:50 +0200
Subject: [PATCH 327/359] Increase buffer for sysfs path
References: bsc#1081910

'unacknowledged_bad_blocks' is a long name for sysfs property and it
makes sysfs path over 50 characters long. Increase buffer to the double
length of the longest path available in sysfs at the moment.

Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 sysfs.c | 36 ++++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

Index: mdadm-3.3.1/sysfs.c
===================================================================
--- mdadm-3.3.1.orig/sysfs.c
+++ mdadm-3.3.1/sysfs.c
@@ -27,6 +27,8 @@
 #include	<dirent.h>
 #include	<ctype.h>
 
+#define MAX_SYSFS_PATH_LEN	120
+
 int load_sys(char *path, char *buf, int len)
 {
 	int fd = open(path, O_RDONLY);
@@ -59,15 +61,15 @@ void sysfs_free(struct mdinfo *sra)
 
 int sysfs_open(char *devnm, char *devname, char *attr)
 {
-	char fname[50];
+	char fname[MAX_SYSFS_PATH_LEN];
 	int fd;
 
-	sprintf(fname, "/sys/block/%s/md/", devnm);
+	snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/", devnm);
 	if (devname) {
-		strcat(fname, devname);
-		strcat(fname, "/");
+		strncat(fname, devname, MAX_SYSFS_PATH_LEN - strlen(fname));
+		strncat(fname, "/", MAX_SYSFS_PATH_LEN - strlen(fname));
 	}
-	strcat(fname, attr);
+	strncat(fname, attr, MAX_SYSFS_PATH_LEN - strlen(fname));
 	fd = open(fname, O_RDWR);
 	if (fd < 0 && errno == EACCES)
 		fd = open(fname, O_RDONLY);
@@ -392,14 +394,16 @@ unsigned long long get_component_size(in
 	 * This returns in units of sectors.
 	 */
 	struct stat stb;
-	char fname[50];
+	char fname[MAX_SYSFS_PATH_LEN];
 	int n;
 	if (fstat(fd, &stb)) return 0;
 	if (major(stb.st_rdev) != (unsigned)get_mdp_major())
-		sprintf(fname, "/sys/block/md%d/md/component_size",
+		snprintf(fname, MAX_SYSFS_PATH_LEN,
+			"/sys/block/md%d/md/component_size",
 			(int)minor(stb.st_rdev));
 	else
-		sprintf(fname, "/sys/block/md_d%d/md/component_size",
+		snprintf(fname, MAX_SYSFS_PATH_LEN,
+			"/sys/block/md_d%d/md/component_size",
 			(int)minor(stb.st_rdev)>>MdpMinorShift);
 	fd = open(fname, O_RDONLY);
 	if (fd < 0)
@@ -415,11 +419,11 @@ unsigned long long get_component_size(in
 int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 		  char *name, char *val)
 {
-	char fname[50];
+	char fname[MAX_SYSFS_PATH_LEN];
 	unsigned int n;
 	int fd;
 
-	sprintf(fname, "/sys/block/%s/md/%s/%s",
+	snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
 		sra->sys_name, dev?dev->sys_name:"", name);
 	fd = open(fname, O_WRONLY);
 	if (fd < 0)
@@ -452,11 +456,11 @@ int sysfs_set_num_signed(struct mdinfo *
 
 int sysfs_uevent(struct mdinfo *sra, char *event)
 {
-	char fname[50];
+	char fname[MAX_SYSFS_PATH_LEN];
 	int n;
 	int fd;
 
-	sprintf(fname, "/sys/block/%s/uevent",
+	snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/uevent",
 		sra->sys_name);
 	fd = open(fname, O_WRONLY);
 	if (fd < 0)
@@ -473,10 +477,10 @@ int sysfs_uevent(struct mdinfo *sra, cha
 
 int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name)
 {
-	char fname[50];
+	char fname[MAX_SYSFS_PATH_LEN];
 	struct stat st;
 
-	sprintf(fname, "/sys/block/%s/md/%s/%s",
+	snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
 		sra->sys_name, dev?dev->sys_name:"", name);
 
 	return stat(fname, &st) == 0;
@@ -485,10 +489,10 @@ int sysfs_attribute_available(struct mdi
 int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
 		       char *name)
 {
-	char fname[50];
+	char fname[MAX_SYSFS_PATH_LEN];
 	int fd;
 
-	sprintf(fname, "/sys/block/%s/md/%s/%s",
+	snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
 		sra->sys_name, dev?dev->sys_name:"", name);
 	fd = open(fname, O_RDWR);
 	if (fd < 0)

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