From: Ivan Safonov <insafonov@gmail.com>
To: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Florian Schilhabel <florian.c.schilhabel@googlemail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Nishka Dasgupta <nishkadg.linux@gmail.com>,
Cristiane Naves <cristianenavescardoso09@gmail.com>,
Wambui Karuga <wambui.karugax@gmail.com>,
Dan Carpenter <dan.carpenter@oracle.com>,
Merwin Trever Ferrao <merwintf@gmail.com>,
Kees Cook <keescook@chromium.org>,
Michael Straube <straube.linux@gmail.com>,
devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
Ivan Safonov <insafonov@gmail.com>
Subject: [PATCH] staging:rtl8712: avoid skb_clone after skb allocation fail
Date: Sun, 31 May 2020 14:05:47 +0300 [thread overview]
Message-ID: <20200531110548.9318-1-insafonov@gmail.com> (raw)
The skb allocated when out of memory is likely to be discarded
during subsequent processing.
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
---
drivers/staging/rtl8712/rtl8712_recv.c | 29 ++++++++++----------------
1 file changed, 11 insertions(+), 18 deletions(-)
diff --git a/drivers/staging/rtl8712/rtl8712_recv.c b/drivers/staging/rtl8712/rtl8712_recv.c
index 116773943a2e..570030be3077 100644
--- a/drivers/staging/rtl8712/rtl8712_recv.c
+++ b/drivers/staging/rtl8712/rtl8712_recv.c
@@ -1037,24 +1037,17 @@ static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
*/
alloc_sz += 6;
pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
- if (pkt_copy) {
- precvframe->u.hdr.pkt = pkt_copy;
- skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
- % 4));
- skb_reserve(pkt_copy, shift_sz);
- memcpy(pkt_copy->data, pbuf, tmp_len);
- precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
- precvframe->u.hdr.rx_tail = pkt_copy->data;
- precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
- } else {
- precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
- if (!precvframe->u.hdr.pkt)
- return;
- precvframe->u.hdr.rx_head = pbuf;
- precvframe->u.hdr.rx_data = pbuf;
- precvframe->u.hdr.rx_tail = pbuf;
- precvframe->u.hdr.rx_end = pbuf + alloc_sz;
- }
+ if (!pkt_copy)
+ return;
+
+ precvframe->u.hdr.pkt = pkt_copy;
+ skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data) % 4));
+ skb_reserve(pkt_copy, shift_sz);
+ memcpy(pkt_copy->data, pbuf, tmp_len);
+ precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
+ precvframe->u.hdr.rx_tail = pkt_copy->data;
+ precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
+
recvframe_put(precvframe, tmp_len);
recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
/* because the endian issue, driver avoid reference to the
--
2.26.2
reply other threads:[~2020-05-31 11:01 UTC|newest]
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