Check return value of snprintf in mount_proc_if_needed()

Signed-off-by: Christian Brauner <christianvanbrauner@gmail.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 0b83960b140db709822a56d83da9cb3f25932b03..8e7fc52f2378bf2bea26bc143e63c27538ed7d41 100644 (file)
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -1431,6 +1431,10 @@ int mount_proc_if_needed(const char *rootfs)
        mypid = (int)getpid();
        INFO("I am %d, /proc/self points to '%s'", mypid, link);
        ret = snprintf(path, MAXPATHLEN, "%s/proc", rootfs);
+       if (ret < 0 || ret >= MAXPATHLEN) {
+               SYSERROR("proc path name too long");
+               return -1;
+       }
        if (linklen < 0) /* /proc not mounted */
                goto domount;
        if (atoi(link) != mypid) {