From c07d35338081d107e57cf37572d8cc931a8e32e2 Mon Sep 17 00:00:00 2001
From: Daniel Thompson <daniel.thompson@linaro.org>
Date: Mon, 2 Mar 2015 14:13:36 +0000
Subject: [PATCH] kdb: Fix handling of kallsyms_symbol_next() return value
References: bsc#1052766
Patch-mainline: v4.15-rc3
Git-commit: c07d35338081d107e57cf37572d8cc931a8e32e2
kallsyms_symbol_next() returns a boolean (true on success). Currently
kdb_read() tests the return value with an inequality that
unconditionally evaluates to true.
This is fixed in the obvious way and, since the conditional branch is
supposed to be unreachable, we also add a WARN_ON().
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
kernel/debug/kdb/kdb_io.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index e74be38245ad..ed5d34925ad0 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -350,7 +350,7 @@ static char *kdb_read(char *buffer, size_t bufsize)
}
kdb_printf("\n");
for (i = 0; i < count; i++) {
- if (kallsyms_symbol_next(p_tmp, i) < 0)
+ if (WARN_ON(!kallsyms_symbol_next(p_tmp, i)))
break;
kdb_printf("%s ", p_tmp);
*(p_tmp + len) = '\0';
--
2.13.6