fix possible null ptr deref in kallsyms_lookup

ugh, this function gets called by our unwinder. recursive backtrace for the win... bisection to find this one was "fun." Signed-off-by: Kyle McMartin <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
akvadrako · May 30, 2007 · 7a74fc4 · 7a74fc4
1 parent b927b3e
commit 7a74fc4
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
@@ -257,7 +257,8 @@ const char *kallsyms_lookup(unsigned long addr,
 		pos = get_symbol_pos(addr, symbolsize, offset);
 		/* Grab name */
 		kallsyms_expand_symbol(get_symbol_offset(pos), namebuf);
-		*modname = NULL;
+		if (modname)
+			*modname = NULL;
 		return namebuf;
 	}