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wifi: ignore truncated tlv in beacon/probes

--- a/sys/src/9/pc/wifi.c

+++ b/sys/src/9/pc/wifi.c

@@ -388,6 +388,8 @@

 	for(e = d + len; d+2 <= e; d = x){

 		d += 2;

 		x = d + d[-1];

+		if(x > e)

+			break;	/* truncated */

 		t = d[-2];

 		/* skip double entries */

-- 

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