linux-kernel - [PATCH] staging: r8188eu: fix a potential NULL pointer dereference

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 24 Apr 2022 00:17:48 +0530
From:   Vihas Makwana <makvihas@...il.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Straube <straube.linux@...il.com>
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        Vihas Makwana <makvihas@...il.com>
Subject: [PATCH] staging: r8188eu: fix a potential NULL pointer dereference

recvframe_chk_defrag() performs a NULL check on psta, but if that check
fails then it dereferences it, which it shouldn't do as psta is NULL.

Set pdefrag_q to NULL if above check fails and let the code after it handle
that case.

Fixes: 1cc18a22b96b ("staging: r8188eu: Add files for new driver - part 5")
Signed-off-by: Vihas Makwana <makvihas@...il.com>
---
 drivers/staging/r8188eu/core/rtw_recv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/r8188eu/core/rtw_recv.c b/drivers/staging/r8188eu/core/rtw_recv.c
index c1005ddaa..db54bceff 100644
--- a/drivers/staging/r8188eu/core/rtw_recv.c
+++ b/drivers/staging/r8188eu/core/rtw_recv.c
@@ -1244,7 +1244,7 @@ struct recv_frame *recvframe_chk_defrag(struct adapter *padapter, struct recv_fr
 			pdefrag_q = NULL;
 		}
 	} else {
-		pdefrag_q = &psta->sta_recvpriv.defrag_q;
+		pdefrag_q = NULL;
 	}
 
 	if ((ismfrag == 0) && (fragnum == 0))
-- 
2.30.2