tg3: fix length overflow in VPD firmware parsing

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Commit 184b89044f ("tg3: Use VPD fw version
when present") introduced VPD parsing that contained a potential length
overflow.

Limit the hardware's reported firmware string length (max 255 bytes) to
stay inside the driver's firmware string length (32 bytes). On overflow,
truncate the formatted firmware string instead of potentially overwriting
portions of the tg3 struct.

http://cansecwest.com/slides/2013/PrivateCore%20CSW%202013.pdf

Signed-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Oded Horovitz <oded@privatecore.com>
Reported-by: Brad Spengler <spender@grsecurity.net>
Cc: stable@vger.kernel.org
Cc: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Kees Cook 2013-03-27 06:40:50 +00:00 • committed by David S. Miller

parent ea872d7712

commit 715230a443

1 changed files with 5 additions and 2 deletions

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drivers/net/ethernet/broadcom/tg3.c

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