utils: check for snprintf() error

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 60d35ed926fd57d126e10a8bcc4fb9cbe373c09a..f1ccf859c0f336c116e1caaf5313b6a7d050ba16 100644 (file)
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -1301,6 +1301,8 @@ int mount_from_at(int dfd_from, const char *path_from,
 
                ret = snprintf(dst_buf, sizeof(dst_buf), "/proc/self/fd/%d", fd_to);
        }
+       if (ret < 0 || ret >= sizeof(src_buf))
+               return -EIO;
 
        if (is_empty_string(src_buf))
                ret = mount(NULL, dst_buf, fstype, mnt_flags, data);