brcmfmac: use local iftype avoiding use-after-free of virtual interface

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commit d77facb884 upstream.

A use-after-free was found using KASAN. In brcmf_p2p_del_if() the virtual
interface is removed using call to brcmf_remove_interface(). After that
the virtual interface instance has been freed and should not be referenced.
Solve this by storing the nl80211 iftype in local variable, which is used
in a couple of places anyway.

Reported-by: Daniel J Blueman <daniel@quora.org>
Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Arend Van Spriel 2017-03-28 09:11:30 +01:00 • committed by Greg Kroah-Hartman

parent c0321505df

commit 9afc076d28

1 changed files with 5 additions and 3 deletions

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drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c

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