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net: sfc: Use scnprintf() for avoiding potential buffer overflow

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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: "David S . Miller" <davem@davemloft.net>
Cc: Edward Cree <ecree@solarflare.com>
Cc: Martin Habets <mhabets@solarflare.com>
Cc: Solarflare linux maintainers <linux-net-drivers@solarflare.com>
Cc: netdev@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Takashi Iwai 2020-03-15 10:35:02 +01:00 committed by David S. Miller
parent 38e0f746c4
commit 5e892880e1
1 changed files with 18 additions and 14 deletions
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32
drivers/net/ethernet/sfc/mcdi.c
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@ -212,12 +212,14 @@ 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. * progress on a NIC at any one time. So no need for locking.
*/ */
for (i = 0; i < hdr_len / 4 && bytes < PAGE_SIZE; i++) 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])); " %08x",
le32_to_cpu(hdr[i].u32[0]));
for (i = 0; i < inlen / 4 && bytes < PAGE_SIZE; i++) 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])); " %08x",
le32_to_cpu(inbuf[i].u32[0]));
netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf); netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf);
} }
@ -302,15 +304,15 @@ static void efx_mcdi_read_response_header(struct efx_nic *efx)
*/ */
for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) { for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) {
efx->type->mcdi_read_response(efx, &hdr, (i * 4), 4); 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])); " %08x", le32_to_cpu(hdr.u32[0]));
} }
for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) { for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) {
efx->type->mcdi_read_response(efx, &hdr, efx->type->mcdi_read_response(efx, &hdr,
mcdi->resp_hdr_len + (i * 4), 4); 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])); " %08x", le32_to_cpu(hdr.u32[0]));
} }
netif_info(efx, hw, efx->net_dev, "MCDI RPC RESP:%s\n", buf); netif_info(efx, hw, efx->net_dev, "MCDI RPC RESP:%s\n", buf);
@ -1417,9 +1419,11 @@ void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
} }
ver_words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_OUT_VERSION); 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[0]),
le16_to_cpu(ver_words[2]), le16_to_cpu(ver_words[3])); le16_to_cpu(ver_words[1]),
le16_to_cpu(ver_words[2]),
le16_to_cpu(ver_words[3]));
/* EF10 may have multiple datapath firmware variants within a /* EF10 may have multiple datapath firmware variants within a
* single version. Report which variants are running. * single version. Report which variants are running.
@ -1427,9 +1431,9 @@ void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) { if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) {
struct efx_ef10_nic_data *nic_data = efx->nic_data; 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->rx_dpcpu_fw_id,
nic_data->tx_dpcpu_fw_id); nic_data->tx_dpcpu_fw_id);
/* It's theoretically possible for the string to exceed 31 /* It's theoretically possible for the string to exceed 31
* characters, though in practice the first three version * characters, though in practice the first three version