Larry Finger <Larry.Finger@xxxxxxxxxxxx> wrote:
> This patch fixes commit 75388acd0cd8 ("add mac80211-based driver for
> legacy BCM43xx devices")
>
> In https://bugzilla.kernel.org/show_bug.cgi?id=207093, a defect in
> b43legacy is reported. Upon testing, thus problem exists on PPC and
> X86 platforms, is present in the oldest kernel tested (3.2), and
> has been present in the driver since it was first added to the kernel.
>
> The problem is a corrupted channel status received from the device.
> Both the internal card in a PowerBook G4 and the PCMCIA version
> (Broadcom BCM4306 with PCI ID 14e4:4320) have the problem. Only Rev, 2
> (revision 4 of the 802.11 core) of the chip has been tested. No other
> devices using b43legacy are available for testing.
>
> Various sources of the problem were considered. Buffer overrun and
> other sources of corruption within the driver were rejected because
> the faulty channel status is always the same, not a random value.
> It was concluded that the faulty data is coming from the device, probably
> due to a firmware bug. As that source is not available, the driver
> must take appropriate action to recover.
>
> At present, the driver reports the error, and them continues to process
> the bad packet. This is believed that to be a mistake, and the correct
> action is to drop the correpted packet.
>
> Fixes: 75388acd0cd8 ("add mac80211-based driver for legacy BCM43xx devices")
> Cc: Stable <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
> Reported-and-tested by: F. Erhard <erhard_f@xxxxxxxxxxx>
Patch applied to wireless-drivers-next.git, thanks.
ec4d3e3a0545 b43legacy: Fix case where channel status is corrupted
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https://patchwork.kernel.org/patch/11478883/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
