Patch "iwlwifi: mvm: writing zero bytes to debugfs causes a crash" has been added to the 4.9-stable tree

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 <[email protected]> know about it.

From: Dan Carpenter <[email protected]>
Date: Thu, 23 Mar 2017 13:40:00 +0300
Subject: iwlwifi: mvm: writing zero bytes to debugfs causes a crash

From: Dan Carpenter <[email protected]>

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.

---
 drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -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 [email protected] 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