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git/get: check getfields count

--- a/sys/src/cmd/git/get.c

+++ b/sys/src/cmd/git/get.c

@@ -266,7 +266,8 @@

 		}

 		first = 0;

-		getfields(buf, sp, nelem(sp), 1, " \t\n\r");

+		if(getfields(buf, sp, nelem(sp), 1, " \t\n\r") < 2)

+			sysfatal("invalid ref line");

 		if(strstr(sp[1], "^{}"))

 			continue;

 		if(!okrefname(sp[1]))

-- 

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