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SubjectRe: [PATCH] net/sun3_82586: Avoid reading past buffer in debug output
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On 2/6/24 10:16, Kees Cook wrote:
> Since NUM_XMIT_BUFFS is always 1, building m68k with sun3_defconfig and
> -Warraybounds, this build warning is visible[1]:
>
> drivers/net/ethernet/i825xx/sun3_82586.c: In function 'sun3_82586_timeout':
> drivers/net/ethernet/i825xx/sun3_82586.c:990:122: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct *[1]' [-Warray-bounds=]
> 990 | printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status));
> | ~~~~~~~~~~~~^~~
> ...
> drivers/net/ethernet/i825xx/sun3_82586.c:156:46: note: while referencing 'xmit_cmds'
> 156 | volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS];
>
> Avoid accessing index 1 since it doesn't exist.
>
> Link: https://github.com/KSPP/linux/issues/325 [1]
> Cc: Sam Creasey <sammy@sammy.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
> Cc: netdev@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks!
--
Gustavo

> ---
> drivers/net/ethernet/i825xx/sun3_82586.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/i825xx/sun3_82586.c b/drivers/net/ethernet/i825xx/sun3_82586.c
> index 5e27470c6b1e..f2d4669c81cf 100644
> --- a/drivers/net/ethernet/i825xx/sun3_82586.c
> +++ b/drivers/net/ethernet/i825xx/sun3_82586.c
> @@ -987,7 +987,7 @@ static void sun3_82586_timeout(struct net_device *dev, unsigned int txqueue)
> {
> #ifdef DEBUG
> printk("%s: xmitter timed out, try to restart! stat: %02x\n",dev->name,p->scb->cus);
> - printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status));
> + printk("%s: command-stats: %04x\n", dev->name, swab16(p->xmit_cmds[0]->cmd_status));
> printk("%s: check, whether you set the right interrupt number!\n",dev->name);
> #endif
> sun3_82586_close(dev);

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