This is a note to let you know that I've just added the patch titled
iwlwifi: mvm: writing zero bytes to debugfs causes a crash
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iwlwifi-mvm-writing-zero-bytes-to-debugfs-causes-a-crash.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 251fe09f13bfb54c1ede66ee8bf8ddd0061c4f7c Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Thu, 23 Mar 2017 13:40:00 +0300
Subject: iwlwifi: mvm: writing zero bytes to debugfs causes a crash
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 251fe09f13bfb54c1ede66ee8bf8ddd0061c4f7c upstream.
This is a static analysis fix. The warning is:
drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c:912 iwl_mvm_fw_dbg_collect()
warn: integer overflows 'sizeof(*desc) + len'
I guess this code is supposed to take a NUL character, but if we write
zero bytes then it tries to write -1 characters and crashes.
Fixes: c91b865cb14d ("iwlwifi: mvm: support description for user triggered fw dbg collection")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -1056,6 +1056,8 @@ static ssize_t iwl_dbgfs_fw_dbg_collect_
if (ret)
return ret;
+ if (count == 0)
+ return 0;
iwl_mvm_fw_dbg_collect(mvm, FW_DBG_TRIGGER_USER, buf,
(count - 1), NULL);
Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are
queue-4.9/scsi-scsi_dh_emc-return-success-in-clariion_std_inquiry.patch
queue-4.9/iwlwifi-mvm-writing-zero-bytes-to-debugfs-causes-a-crash.patch