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Date: Thu, 28 May 2020 21:39:48 -0700 From: Jeff Kirsher <jeffrey.t.kirsher@...el.com> To: davem@...emloft.net Cc: Takashi Iwai <tiwai@...e.de>, netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com, Andrew Bowers <andrewx.bowers@...el.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com> Subject: [net-next 01/17] i40e: Use scnprintf() for avoiding potential buffer overflow From: Takashi Iwai <tiwai@...e.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(). Signed-off-by: Takashi Iwai <tiwai@...e.de> Tested-by: Andrew Bowers <andrewx.bowers@...el.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com> --- drivers/net/ethernet/intel/i40e/i40e_main.c | 24 ++++++++++----------- 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index ea7395b391e5..5d807c8004f8 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -14486,29 +14486,29 @@ static void i40e_print_features(struct i40e_pf *pf) i = snprintf(buf, INFO_STRING_LEN, "Features: PF-id[%d]", hw->pf_id); #ifdef CONFIG_PCI_IOV - i += snprintf(&buf[i], REMAIN(i), " VFs: %d", pf->num_req_vfs); + i += scnprintf(&buf[i], REMAIN(i), " VFs: %d", pf->num_req_vfs); #endif - i += snprintf(&buf[i], REMAIN(i), " VSIs: %d QP: %d", + i += scnprintf(&buf[i], REMAIN(i), " VSIs: %d QP: %d", pf->hw.func_caps.num_vsis, pf->vsi[pf->lan_vsi]->num_queue_pairs); if (pf->flags & I40E_FLAG_RSS_ENABLED) - i += snprintf(&buf[i], REMAIN(i), " RSS"); + i += scnprintf(&buf[i], REMAIN(i), " RSS"); if (pf->flags & I40E_FLAG_FD_ATR_ENABLED) - i += snprintf(&buf[i], REMAIN(i), " FD_ATR"); + i += scnprintf(&buf[i], REMAIN(i), " FD_ATR"); if (pf->flags & I40E_FLAG_FD_SB_ENABLED) { - i += snprintf(&buf[i], REMAIN(i), " FD_SB"); - i += snprintf(&buf[i], REMAIN(i), " NTUPLE"); + i += scnprintf(&buf[i], REMAIN(i), " FD_SB"); + i += scnprintf(&buf[i], REMAIN(i), " NTUPLE"); } if (pf->flags & I40E_FLAG_DCB_CAPABLE) - i += snprintf(&buf[i], REMAIN(i), " DCB"); - i += snprintf(&buf[i], REMAIN(i), " VxLAN"); - i += snprintf(&buf[i], REMAIN(i), " Geneve"); + i += scnprintf(&buf[i], REMAIN(i), " DCB"); + i += scnprintf(&buf[i], REMAIN(i), " VxLAN"); + i += scnprintf(&buf[i], REMAIN(i), " Geneve"); if (pf->flags & I40E_FLAG_PTP) - i += snprintf(&buf[i], REMAIN(i), " PTP"); + i += scnprintf(&buf[i], REMAIN(i), " PTP"); if (pf->flags & I40E_FLAG_VEB_MODE_ENABLED) - i += snprintf(&buf[i], REMAIN(i), " VEB"); + i += scnprintf(&buf[i], REMAIN(i), " VEB"); else - i += snprintf(&buf[i], REMAIN(i), " VEPA"); + i += scnprintf(&buf[i], REMAIN(i), " VEPA"); dev_info(&pf->pdev->dev, "%s\n", buf); kfree(buf); -- 2.26.2
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