mwifiex: fix memory corruption when unsetting multicast list

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When trying to unset a previously-set multicast list (i.e. the new list
has 0 entries), mwifiex_set_multicast_list() was calling down to
mwifiex_request_set_multicast_list() while leaving
mcast_list.num_multicast_addr as an uninitialized value.

We were arriving at mwifiex_cmd_mac_multicast_adr() which would then
proceed to do an often huge memcpy of
mcast_list.num_multicast_addr*ETH_ALEN bytes, causing memory corruption
and hard to debug crashes.

Fix this by setting mcast_list.num_multicast_addr to 0 when no multicast
list is provided. Similarly, fix up the logic in
mwifiex_request_set_multicast_list() to unset the multicast list that
was previously sent to the hardware in such cases.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

...

This commit is contained in:

Daniel Drake 2013-06-14 15:24:24 -04:00 • committed by John W. Linville

parent 3c68ef5b22

commit 6390d88529

2 changed files with 10 additions and 13 deletions

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5

drivers/net/wireless/mwifiex/main.c

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18

drivers/net/wireless/mwifiex/sta_ioctl.c

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