Messages in this thread | | | Date | Thu, 8 Feb 2024 08:12:09 -0600 | Subject | Re: [PATCH] net/sun3_82586: Avoid reading past buffer in debug output | From | "Gustavo A. R. Silva" <> |
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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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