Commit f5970a2a authored by Haggai Eran's avatar Haggai Eran Committed by Luis Henriques

staging: rtl8712: prevent buffer overrun in recvbuf2recvframe

commit cab46214 upstream.

With an RTL8191SU USB adaptor, sometimes the hints for a fragmented
packet are set, but the packet length is too large. Allocate enough
space to prevent memory corruption and a resulting kernel panic [1].

[1] http://www.spinics.net/lists/linux-wireless/msg136546.htmlSigned-off-by: default avatarHaggai Eran <haggai.eran@gmail.com>
ACKed-by: default avatarLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent fffe033f
......@@ -1069,7 +1069,8 @@ static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
/* for first fragment packet, driver need allocate 1536 +
* drvinfo_sz + RXDESC_SIZE to defrag packet. */
if ((mf == 1) && (frag == 0))
alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
/*1658+6=1664, 1664 is 128 alignment.*/
alloc_sz = max_t(u16, tmp_len, 1658);
else
alloc_sz = tmp_len;
/* 2 is for IP header 4 bytes alignment in QoS packet case.
......
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