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From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Stephen Hemminger <stephen@networkplumber.org>,
	stable@dpdk.org, Byron Marohn <byron.marohn@intel.com>,
	Yipeng Wang <yipeng1.wang@intel.com>,
	Pablo de Lara <pablo.de.lara.guarch@intel.com>,
	Saikrishna Edupuganti <saikrishna.edupuganti@intel.com>,
	Christian Maciocco <christian.maciocco@intel.com>
Subject: [PATCH 1/3] examples/server_node_efd: fix format overflow
Date: Mon, 10 Nov 2025 10:19:33 -0800	[thread overview]
Message-ID: <20251110182209.104087-2-stephen@networkplumber.org> (raw)
In-Reply-To: <20251110182209.104087-1-stephen@networkplumber.org>

If format-truncation is enabled, the compiler detects a string overflow
since the snprintf() is putting ethernet address and new line
in buffer only sized for the address.

Fixes: 39aad0e88c58 ("examples/flow_distributor: new example to demonstrate EFD")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/server_node_efd/efd_server/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/server_node_efd/efd_server/main.c b/examples/server_node_efd/efd_server/main.c
index 75ff0ea532..62c3f4a16d 100644
--- a/examples/server_node_efd/efd_server/main.c
+++ b/examples/server_node_efd/efd_server/main.c
@@ -68,7 +68,7 @@ static const char *
 get_printable_mac_addr(uint16_t port)
 {
 	static const char err_address[] = "00:00:00:00:00:00";
-	static char addresses[RTE_MAX_ETHPORTS][sizeof(err_address)];
+	static char addresses[RTE_MAX_ETHPORTS][RTE_ETHER_ADDR_FMT_SIZE + 1];
 	struct rte_ether_addr mac;
 	int ret;
 
-- 
2.51.0


  reply	other threads:[~2025-11-10 18:22 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-11-10 18:19 [PATCH 0/3] examples: format truncation bugs Stephen Hemminger
2025-11-10 18:19 ` Stephen Hemminger [this message]
2025-11-10 18:19 ` [PATCH 2/3] examples/vdpa: fix format overflow warning Stephen Hemminger
2025-11-10 18:19 ` [PATCH 3/3] examples: re-enable format truncation warning Stephen Hemminger
2025-11-11 22:17 ` [PATCH v2 0/7] fix format-truncation warnings Stephen Hemminger
2025-11-11 22:17   ` [PATCH v2 1/7] examples/server_node_efd: fix format overflow Stephen Hemminger
2025-11-11 22:17   ` [PATCH v2 2/7] examples/vdpa: fix format overflow warning Stephen Hemminger
2025-11-11 22:17   ` [PATCH v2 3/7] examples/ip_reassembly: add check before formatting name Stephen Hemminger
2025-11-11 22:17   ` [PATCH v2 4/7] examples: re-enable format truncation warning Stephen Hemminger
2025-11-11 22:17   ` [PATCH v2 5/7] test: refactor file prefix arg handling Stephen Hemminger
2025-11-11 22:17   ` [PATCH v2 6/7] test: increase size of memzone name Stephen Hemminger
2025-11-11 22:17   ` [PATCH v2 7/7] test: re-enable format-truncation warnings Stephen Hemminger

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