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From d2af9b566554e01f9ad67b330ce569dbc130e5d3 Mon Sep 17 00:00:00 2001
From: Franky Lin <franky.lin@broadcom.com>
Date: Wed, 16 May 2018 14:12:01 +0200
Subject: [PATCH] brcmfmac: validate user provided data for memdump before
copying
In patch "brcmfmac: add support for sysfs initiated coredump", a new
scenario of brcmf_debug_create_memdump was added in which the user of
the function might not necessarily provide prefix data. Hence the
function should not assume the data is always valid and should perform a
check before copying.
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
@@ -40,7 +40,8 @@ int brcmf_debug_create_memdump(struct br
if (!dump)
return -ENOMEM;
- memcpy(dump, data, len);
+ if (data && len > 0)
+ memcpy(dump, data, len);
err = brcmf_bus_get_memdump(bus, dump + len, ramsize);
if (err) {
vfree(dump);
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