tree 60b08dcc4a18caeec4c72c9fae59307c2fe2d579
parent a95600294157ca7527ee7c70249fb53e09d8c566
author Dan Carpenter <dan.carpenter@oracle.com> 1490265600 +0300
committer Luca Coelho <luciano.coelho@intel.com> 1490368525 +0200

iwlwifi: mvm: writing zero bytes to debugfs causes a crash

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@oracle.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>