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From:   Yongcheng Yang <yoyang@redhat.com>
To:     Steve Dickson <steved@redhat.com>
Cc:     Linux NFS Mailing list <linux-nfs@vger.kernel.org>,
        Herb Wartens <wartens2@llnl.gov>,
        Yongcheng Yang <yoyang@redhat.com>
Subject: [PATCH 1/2] rpcb_clnt.c: fix a possible double free
Date:   Tue,  1 Aug 2023 17:33:09 +0800
Message-Id: <20230801093310.594942-2-yoyang@redhat.com>
In-Reply-To: <20230801093310.594942-1-yoyang@redhat.com>
References: <20230801093310.594942-1-yoyang@redhat.com>
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Signed-off-by: Herb Wartens <wartens2@llnl.gov>
---
 src/rpcb_clnt.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/rpcb_clnt.c b/src/rpcb_clnt.c
index d178d86..630f9ad 100644
--- a/src/rpcb_clnt.c
+++ b/src/rpcb_clnt.c
@@ -252,12 +252,16 @@ delete_cache(addr)
 	for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
 		if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
 			/* Unlink from cache. We'll destroy it after releasing the mutex. */
-			if (cptr->ac_uaddr)
+			if (cptr->ac_uaddr) {
 				free(cptr->ac_uaddr);
-			if (prevptr)
+				cptr->ac_uaddr = NULL;
+			}
+			if (prevptr) {
 				prevptr->ac_next = cptr->ac_next;
-			else
+			}
+			else {
 				front = cptr->ac_next;
+			}
 			cachesize--;
 			break;
 		}
-- 
2.31.1