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SubjectRe: [PATCH] iwlwifi: actually check allocated conf_tlv pointer
On Sun, Apr 5, 2020 at 11:14 AM Kalle Valo <kvalo@codeaurora.org> wrote:
>
> Luca Coelho <luca@coelho.fi> writes:
>
> > On Sun, 2020-04-05 at 11:44 +0300, Kalle Valo wrote:
> >> Chris Rorvick <chris@rorvick.com> writes:
> >>
> >> > Commit 71bc0334a637 ("iwlwifi: check allocated pointer when allocating
> >> > conf_tlvs") attempted to fix a typoe introduced by commit 17b809c9b22e
> >> > ("iwlwifi: dbg: move debug data to a struct") but does not implement the
> >> > check correctly.
> >> >
> >> > Tweeted-by: @grsecurity
> >> > Signed-off-by: Chris Rorvick <chris@rorvick.com>
> >>
> >> I'll add:
> >>
> >> Fixes: 71bc0334a637 ("iwlwifi: check allocated pointer when allocating conf_tlvs")
> >>
> >> > ---
> >> > In this wasn't picked up?
> >>
> >> Luca, can I take this directly?
> >
> > Yes, please take it directly.
>
> Ok, assigned it to me in patchwork.
>
> > This can happen in OOM situations and, when it does, we will
> > potentially try to dereference a NULL pointer.
>
> I'll add this to the commit log.
>

Hi,

Friendly ping.

Any progress on this?

This patch seems not have landed in Linux v5.7-rc1.

$ head -5 Makefile
# SPDX-License-Identifier: GPL-2.0
VERSION = 5
PATCHLEVEL = 7
SUBLEVEL = 0
EXTRAVERSION = -rc1

$ LC_ALL=C git apply --check --verbose
../patches/iwlwifi-fixes-5.6/iwlwifi-actually-check-allocated-conf_tlv-pointer-v2-dileks.patch
Checking patch drivers/net/wireless/intel/iwlwifi/iwl-drv.c...

I have attached my v2 which I have tested on top of Linux v5.6.3.

Feel free to add my...

Tested-by: Sedat Dilek <sedat.dilek@gmail.com>

Regards,
- Sedat -
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From: Chris Rorvick <chris@rorvick.com>
To: linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Chris Rorvick <chris@rorvick.com>,
Johannes Berg <johannes.berg@intel.com>,
Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
Luca Coelho <luciano.coelho@intel.com>,
Intel Linux Wireless <linuxwifi@intel.com>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH] iwlwifi: actually check allocated conf_tlv pointer
Date: Thu, 2 Apr 2020 00:02:19 -0500
Message-Id: <20200402050219.4842-1-chris@rorvick.com>
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Commit 71bc0334a637 ("iwlwifi: check allocated pointer when allocating
conf_tlvs") attempted to fix a typoe introduced by commit 17b809c9b22e
("iwlwifi: dbg: move debug data to a struct") but does not implement the
check correctly.

Fixes: 71bc0334a637 ("iwlwifi: check allocated pointer when allocating conf_tlvs")
Tweeted-by: @grsecurity
Signed-off-by: Chris Rorvick <chris@rorvick.com>
---

[ v1->v2:
- Fix typo s/fw.dbg_conf_tlv/fw.dbg.conf_tlv
- Add Fixes tag as suggested by Kalle
-dileks ]

drivers/net/wireless/intel/iwlwifi/iwl-drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
index ff52e69c1c80..a37f330e7bd4 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
@@ -1465,11 +1465,11 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
if (pieces->dbg_conf_tlv[i]) {
drv->fw.dbg.conf_tlv[i] =
kmemdup(pieces->dbg_conf_tlv[i],
pieces->dbg_conf_tlv_len[i],
GFP_KERNEL);
- if (!pieces->dbg_conf_tlv[i])
+ if (!drv->fw.dbg.conf_tlv[i])
goto out_free_fw;
}
}

memset(&trigger_tlv_sz, 0xff, sizeof(trigger_tlv_sz));
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