mount.fuse.c: fix potential accessing NULL pointer

In mount.fuse.c, pwd is set by calling getpwnam func.
If the matching entry is not found or an error occurs in
getpwnam func, pwd will be NULL. So we need to check
whether pwd is NULL before accessing it.

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Signed-off-by: Haotian Li <lihaotian9@huawei.com>

diff --git a/util/mount.fuse.c b/util/mount.fuse.c
index dc59c9d5653d327c08f11fca774face9ceedbe4b..1fc98f1e3408cdd0c147828b42651119b2c09b39 100644 (file)
--- a/util/mount.fuse.c
+++ b/util/mount.fuse.c
@@ -398,7 +398,7 @@ int main(int argc, char *argv[])
 #endif
 
                struct passwd *pwd = getpwnam(setuid_name);
-               if (setgid(pwd->pw_gid) == -1 || setuid(pwd->pw_uid) == -1) {
+               if (!pwd || setgid(pwd->pw_gid) == -1 || setuid(pwd->pw_uid) == -1) {
                        fprintf(stderr, "%s: Failed to setuid to %s: %s\n",
                                progname, setuid_name, strerror(errno));
                        exit(1);