Re: [PATCH v3 3/9] brcmfmac: firmware: Do not crash on a NULL board_type

[Dmitry Osipenko]

17.01.2022 17:29, Hector Martin пишет:
> This unbreaks support for USB devices, which do not have a board_type
> to create an alt_path out of and thus were running into a NULL
> dereference.
> 
> Fixes: 5ff013914c62 ("brcmfmac: firmware: Allow per-board firmware binaries")
> Signed-off-by: Hector Martin <marcan@xxxxxxxxx>

Technically, all patches that are intended to be included into next
stable kernel update require the "Cc: stable@xxxxxxxxxxxxxxx" tag.

In practice such patches usually auto-picked by the patch bot, so no
need to resend.

> ---
>  drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> index 1001c8888bfe..63821856bbe1 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> @@ -599,6 +599,9 @@ static char *brcm_alt_fw_path(const char *path, const char *board_type)
>  	char alt_path[BRCMF_FW_NAME_LEN];
>  	char suffix[5];
>  
> +	if (!board_type)
> +		return NULL;
> +
>  	strscpy(alt_path, path, BRCMF_FW_NAME_LEN);
>  	/* At least one character + suffix */
>  	if (strlen(alt_path) < 5)

Good catch!

Reviewed-by: Dmitry Osipenko <digetx@xxxxxxxxx>