From f3b6b7f2124b71b21ffb6f0c76f2749edccc0d44 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Sat, 16 Oct 2021 11:43:58 +0300
Subject: [PATCH] iwlwifi: pnvm: read EFI data only if long enough
Git-commit: e864a77f51d0d8113b49cf7d030bc9dc911c8176
Patch-mainline: v5.16-rc1
References: stable-5.14.19
[ Upstream commit e864a77f51d0d8113b49cf7d030bc9dc911c8176 ]
If the data we get from EFI is not even long enough for
the package struct we expect then ignore it entirely.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Fixes: a1a6a4cf49ec ("iwlwifi: pnvm: implement reading PNVM from UEFI")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20211016114029.33feba783518.I54a5cf33975d0330792b3d208b225d479e168f32@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/intel/iwlwifi/fw/pnvm.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c b/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c
index 512c512eefc7..24de6e5eb6a4 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c
@@ -284,9 +284,13 @@ int iwl_pnvm_load(struct iwl_trans *trans,
/* First attempt to get the PNVM from BIOS */
package = iwl_uefi_get_pnvm(trans, &len);
if (!IS_ERR_OR_NULL(package)) {
- /* we need only the data */
- len -= sizeof(*package);
- data = kmemdup(package->data, len, GFP_KERNEL);
+ if (len >= sizeof(*package)) {
+ /* we need only the data */
+ len -= sizeof(*package);
+ data = kmemdup(package->data, len, GFP_KERNEL);
+ } else {
+ data = NULL;
+ }
/* free package regardless of whether kmemdup succeeded */
kfree(package);
--
2.26.2