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Date: Tue, 12 Dec 2023 14:13:12 -0800
From: Kees Cook <keescook@...omium.org>
To: Shyam Sundar S K <Shyam-sundar.S-k@....com>
Cc: Kees Cook <keescook@...omium.org>,
kernel test robot <lkp@...el.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org
Subject: [PATCH] amd-xgbe: Avoid potential string truncation in name
Build with W=1 were warning about a potential string truncation:
drivers/net/ethernet/amd/xgbe/xgbe-drv.c: In function 'xgbe_alloc_channels':
drivers/net/ethernet/amd/xgbe/xgbe-drv.c:211:73: warning: '%u' directive output may be truncated writing between 1 and 10 bytes into a region of size 8 [-Wformat-truncation=]
211 | snprintf(channel->name, sizeof(channel->name), "channel-%u", i);
| ^~
drivers/net/ethernet/amd/xgbe/xgbe-drv.c:211:64: note: directive argument in the range [0, 4294967294]
211 | snprintf(channel->name, sizeof(channel->name), "channel-%u", i);
| ^~~~~~~~~~~~
drivers/net/ethernet/amd/xgbe/xgbe-drv.c:211:17: note: 'snprintf' output between 10 and 19 bytes into a destination of size 16
211 | snprintf(channel->name, sizeof(channel->name), "channel-%u", i);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Increase the size of the "name" buffer to handle the full format range.
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312100937.ZPZCARhB-lkp@intel.com/
Cc: Shyam Sundar S K <Shyam-sundar.S-k@....com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/net/ethernet/amd/xgbe/xgbe.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h b/drivers/net/ethernet/amd/xgbe/xgbe.h
index ad136ed493ed..f01a1e566da6 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
@@ -495,7 +495,7 @@ struct xgbe_ring {
* a DMA channel.
*/
struct xgbe_channel {
- char name[16];
+ char name[20];
/* Address of private data area for device */
struct xgbe_prv_data *pdata;
--
2.34.1
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