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

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commit 251fe09f13 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: c91b865cb1 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Dan Carpenter 2017-03-23 13:40:00 +03:00 • committed by Greg Kroah-Hartman

parent 1fb264cf7d

commit 3b141e2965

1 changed files with 2 additions and 0 deletions

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drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c

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