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[6/8] brcmfmac: validate user provided data for memdump before copying

Message ID 1526375691-31789-7-git-send-email-arend.vanspriel@broadcom.com (mailing list archive)
State Changes Requested
Delegated to: Kalle Valo
Headers show

Commit Message

Arend van Spriel May 15, 2018, 9:14 a.m. UTC 
From: Franky Lin <franky.lin@broadcom.com>

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>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
index 5048320..489b5df 100644
--- 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 brcmf_bus *bus, const void *data,
 	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);