Increase buffer for sysfs path

'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>

diff --git a/sysfs.c b/sysfs.c
index d28e21a251eba7851a27c6ba96a97f9795e10259..f8a9f0b7701e1f7fe61690caf977021c3f421642 100644 (file)
--- a/sysfs.c
+++ b/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);
@@ -392,15 +394,17 @@ unsigned long long get_component_size(int fd)
         * 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)
@@ -416,11 +420,11 @@ unsigned long long get_component_size(int fd)
 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)
@@ -453,11 +457,11 @@ int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev,
 
 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)
@@ -474,10 +478,10 @@ int sysfs_uevent(struct mdinfo *sra, char *event)
 
 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;
@@ -486,10 +490,10 @@ int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name
 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)