From: Takashi Iwai <tiwai@suse.de>
To: netdev@vger.kernel.org
Cc: "David S . Miller" <davem@davemloft.net>,
Solarflare linux maintainers <linux-net-drivers@solarflare.com>,
Edward Cree <ecree@solarflare.com>,
Martin Habets <mhabets@solarflare.com>
Subject: [PATCH 6/7] sfc: Use scnprintf() for avoiding potential buffer overflow
Date: Wed, 11 Mar 2020 09:37:44 +0100 [thread overview]
Message-ID: <20200311083745.17328-7-tiwai@suse.de> (raw)
In-Reply-To: <20200311083745.17328-1-tiwai@suse.de>
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);
--
2.16.4
next prev parent reply other threads:[~2020-03-11 8:38 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 ` Takashi Iwai [this message]
2020-03-12 9:53 ` [PATCH 6/7] sfc: " Martin Habets
2020-03-12 11:38 ` Takashi Iwai
2020-03-11 8:37 ` [PATCH 7/7] netdevsim: " Takashi Iwai
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