linux-kernel - [PATCH] afs: Fix check for NULL terminator

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Message-ID: <4119428.1753108152@warthog.procyon.org.uk>
Date: Mon, 21 Jul 2025 15:29:12 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <brauner@...nel.org>
cc: dhowells@...hat.com,
    syzbot+7741f872f3c53385a2e2@...kaller.appspotmail.com,
    Leo Stone <leocstone@...il.com>,
    Marc Dionne <marc.dionne@...istor.com>,
    linux-afs@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
    linux-kernel@...r.kernel.org
Subject: [PATCH] afs: Fix check for NULL terminator

From: Leo Stone <leocstone@...il.com>
    
Add a missing check for reaching the end of the string while attempting
to split a command.

Fixes: f94f70d39cc2 ("afs: Provide a way to configure address priorities")
Reported-by: syzbot+7741f872f3c53385a2e2@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=7741f872f3c53385a2e2
Signed-off-by: Leo Stone <leocstone@...il.com>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
cc: linux-fsdevel@...r.kernel.org
---
 fs/afs/addr_prefs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/afs/addr_prefs.c b/fs/afs/addr_prefs.c
index c0384201b8fe..133736412c3d 100644
--- a/fs/afs/addr_prefs.c
+++ b/fs/afs/addr_prefs.c
@@ -48,7 +48,7 @@ static int afs_split_string(char **pbuf, char *strv[], unsigned int maxstrv)
 		strv[count++] = p;
 
 		/* Skip over word */
-		while (!isspace(*p))
+		while (!isspace(*p) && *p)
 			p++;
 		if (!*p)
 			break;