package/kernel/mac80211/patches/335-v4.18-0004-brcmfmac-validate-user-provided-data-for-memdump-bef.patch

   1 From d2af9b566554e01f9ad67b330ce569dbc130e5d3 Mon Sep 17 00:00:00 2001
   2 From: Franky Lin <franky.lin@broadcom.com>
   3 Date: Wed, 16 May 2018 14:12:01 +0200
   4 Subject: [PATCH] brcmfmac: validate user provided data for memdump before
   5  copying
   6
   7 In patch "brcmfmac: add support for sysfs initiated coredump", a new
   8 scenario of brcmf_debug_create_memdump was added in which the user of
   9 the function might not necessarily provide prefix data. Hence the
  10 function should not assume the data is always valid and should perform a
  11 check before copying.
  12
  13 Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  14 Signed-off-by: Franky Lin <franky.lin@broadcom.com>
  15 Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  16 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  17 ---
  18  drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c | 3 ++-
  19  1 file changed, 2 insertions(+), 1 deletion(-)
  20
  21 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
  22 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
  23 @@ -40,7 +40,8 @@ int brcmf_debug_create_memdump(struct br
  24         if (!dump)
  25                 return -ENOMEM;
  26
  27 -       memcpy(dump, data, len);
  28 +       if (data && len > 0)
  29 +               memcpy(dump, data, len);
  30         err = brcmf_bus_get_memdump(bus, dump + len, ramsize);
  31         if (err) {
  32                 vfree(dump);