From: Martin Habets <mhabets@solarflare.com>
To: Takashi Iwai <tiwai@suse.de>, <netdev@vger.kernel.org>
Cc: "David S . Miller" <davem@davemloft.net>,
Solarflare linux maintainers <linux-net-drivers@solarflare.com>,
Edward Cree <ecree@solarflare.com>
Subject: Re: [PATCH 6/7] sfc: Use scnprintf() for avoiding potential buffer overflow
Date: Thu, 12 Mar 2020 09:53:05 +0000 [thread overview]
Message-ID: <92ac1339-892c-20de-1547-02a8eee85f12@solarflare.com> (raw)
In-Reply-To: <20200311083745.17328-7-tiwai@suse.de>
Hi Takashi,
Fix looks ok, but could you please fix the alignment of the subsequent lines as well?
Thanks,
Martin
On 11/03/2020 08:37, Takashi Iwai wrote:
> Since snprintf() returns the would-be-output size instead of the
> actual output size, the succeeding calls may go beyond the given
> buffer limit. Fix it by replacing with scnprintf().
>
> Cc: Solarflare linux maintainers <linux-net-drivers@solarflare.com>
> Cc: Edward Cree <ecree@solarflare.com>
> Cc: Martin Habets <mhabets@solarflare.com>
> Signed-off-by: Takashi Iwai <tiwai@suse.de>
> ---
> drivers/net/ethernet/sfc/mcdi.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c
> index 2713300343c7..ac978e24644f 100644
> --- a/drivers/net/ethernet/sfc/mcdi.c
> +++ b/drivers/net/ethernet/sfc/mcdi.c
> @@ -212,11 +212,11 @@ static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
> * progress on a NIC at any one time. So no need for locking.
> */
> for (i = 0; i < hdr_len / 4 && bytes < PAGE_SIZE; i++)
> - bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
> + bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
> " %08x", le32_to_cpu(hdr[i].u32[0]));
>
> for (i = 0; i < inlen / 4 && bytes < PAGE_SIZE; i++)
> - bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
> + bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
> " %08x", le32_to_cpu(inbuf[i].u32[0]));
>
> netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf);
> @@ -302,14 +302,14 @@ static void efx_mcdi_read_response_header(struct efx_nic *efx)
> */
> for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) {
> efx->type->mcdi_read_response(efx, &hdr, (i * 4), 4);
> - bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
> + bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
> " %08x", le32_to_cpu(hdr.u32[0]));
> }
>
> for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) {
> efx->type->mcdi_read_response(efx, &hdr,
> mcdi->resp_hdr_len + (i * 4), 4);
> - bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
> + bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
> " %08x", le32_to_cpu(hdr.u32[0]));
> }
>
> @@ -1417,7 +1417,7 @@ void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
> }
>
> ver_words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_OUT_VERSION);
> - offset = snprintf(buf, len, "%u.%u.%u.%u",
> + offset = scnprintf(buf, len, "%u.%u.%u.%u",
> le16_to_cpu(ver_words[0]), le16_to_cpu(ver_words[1]),
> le16_to_cpu(ver_words[2]), le16_to_cpu(ver_words[3]));
>
> @@ -1427,7 +1427,7 @@ void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
> if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) {
> struct efx_ef10_nic_data *nic_data = efx->nic_data;
>
> - offset += snprintf(buf + offset, len - offset, " rx%x tx%x",
> + offset += scnprintf(buf + offset, len - offset, " rx%x tx%x",
> nic_data->rx_dpcpu_fw_id,
> nic_data->tx_dpcpu_fw_id);
>
>
next prev parent reply other threads:[~2020-03-12 9:53 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 8:37 [PATCH 0/7] net: Use scnprintf() for avoiding potential buffer overflow Takashi Iwai
2020-03-11 8:37 ` [PATCH 1/7] net: caif: " Takashi Iwai
2020-03-11 8:37 ` [PATCH 2/7] i40e: " Takashi Iwai
2020-03-16 20:32 ` [Intel-wired-lan] " Bowers, AndrewX
2020-03-11 8:37 ` [PATCH 3/7] mlx4: " Takashi Iwai
2020-03-11 8:37 ` [PATCH 4/7] nfp: " Takashi Iwai
2020-03-11 11:01 ` [oss-drivers] " Simon Horman
2020-03-11 21:44 ` Jakub Kicinski
2020-03-11 8:37 ` [PATCH 5/7] ionic: " Takashi Iwai
2020-03-11 11:01 ` [oss-drivers] " Simon Horman
2020-03-11 16:45 ` Shannon Nelson
2020-03-11 8:37 ` [PATCH 6/7] sfc: " Takashi Iwai
2020-03-12 9:53 ` Martin Habets [this message]
2020-03-12 11:38 ` Takashi Iwai
2020-03-11 8:37 ` [PATCH 7/7] netdevsim: " Takashi Iwai
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