commit ea536a2e641664c8ea439e5e571e757785f587c9
Author: Zhi Li <yieli@redhat.com>
Date:   Mon Oct 24 13:31:41 2022 -0400

    mount.nfs: fix NULL pointer derefernce in nfs_parse_square_bracket
    
    In function nfs_parse_square_bracket, hostname could be NULL,
    dereferencing it in free(*hostname) may cause an unexpected segfault.
    
    Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2136807
    Signed-off-by: Zhi Li <yieli@redhat.com>
    Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/utils/mount/parse_dev.c b/utils/mount/parse_dev.c
index 0d3bcb95..2ade5d5d 100644
--- a/utils/mount/parse_dev.c
+++ b/utils/mount/parse_dev.c
@@ -170,7 +170,8 @@ static int nfs_parse_square_bracket(const char *dev,
 	if (pathname) {
 		*pathname = strndup(cbrace, path_len);
 		if (*pathname == NULL) {
-			free(*hostname);
+			if (hostname)
+				free(*hostname);
 			return nfs_pdn_nomem_err();
 		}
 	}