From: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Date: Thu, 5 Nov 2020 08:39:52 +0000 (+0800)
Subject: mount.fuse.c: fix potential accessing NULL pointer
X-Git-Tag: fuse-3.10.1~8
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8b318a7ed691a075b89c7d095bf582af957fb075;p=qemu-gpiodev%2Flibfuse.git

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 dc59c9d..1fc98f1 100644
--- 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);