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staging: rtl8712: prevent buffer overrun in recvbuf2recvframe
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.html Cc: <stable@vger.kernel.org> Signed-off-by: Haggai Eran <haggai.eran@gmail.com> ACKed-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1056,7 +1056,8 @@ static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
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/* for first fragment packet, driver need allocate 1536 +
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* drvinfo_sz + RXDESC_SIZE to defrag packet. */
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if ((mf == 1) && (frag == 0))
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alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
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/*1658+6=1664, 1664 is 128 alignment.*/
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alloc_sz = max_t(u16, tmp_len, 1658);
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else
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alloc_sz = tmp_len;
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/* 2 is for IP header 4 bytes alignment in QoS packet case.
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