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net: ionic: 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().

Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Shannon Nelson <snelson@pensando.io>
Cc: "David S . Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: oss-drivers@netronome.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 10:35:01 +01:00 committed by David S. Miller
parent 413ae546f8
commit 38e0f746c4
1 changed files with 7 additions and 7 deletions
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14
drivers/net/ethernet/pensando/ionic/ionic_lif.c
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@ -948,18 +948,18 @@ static void ionic_lif_rx_mode(struct ionic_lif *lif, unsigned int rx_mode)
int i;
#define REMAIN(__x) (sizeof(buf) - (__x))
i = snprintf(buf, sizeof(buf), "rx_mode 0x%04x -> 0x%04x:",
lif->rx_mode, rx_mode);
i = scnprintf(buf, sizeof(buf), "rx_mode 0x%04x -> 0x%04x:",
lif->rx_mode, rx_mode);
if (rx_mode & IONIC_RX_MODE_F_UNICAST)
i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_UNICAST");
i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_UNICAST");
if (rx_mode & IONIC_RX_MODE_F_MULTICAST)
i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_MULTICAST");
i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_MULTICAST");
if (rx_mode & IONIC_RX_MODE_F_BROADCAST)
i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_BROADCAST");
i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_BROADCAST");
if (rx_mode & IONIC_RX_MODE_F_PROMISC)
i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_PROMISC");
i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_PROMISC");
if (rx_mode & IONIC_RX_MODE_F_ALLMULTI)
i += snprintf(&buf[i], REMAIN(i), " RX_MODE_F_ALLMULTI");
i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_ALLMULTI");
netdev_dbg(lif->netdev, "lif%d %s\n", lif->index, buf);
err = ionic_adminq_post_wait(lif, &ctx);