From: Bruce Richardson <bruce.richardson@intel.com>
To: dev@dpdk.org
Cc: Bruce Richardson <bruce.richardson@intel.com>,
stable@dpdk.org, Anatoly Burakov <anatoly.burakov@intel.com>
Subject: [dpdk-dev] [PATCH 3/4] examples/mp_server: fix snprintf overflow
Date: Fri, 14 Aug 2020 12:00:44 +0100 [thread overview]
Message-ID: <20200814110045.217724-4-bruce.richardson@intel.com> (raw)
In-Reply-To: <20200814110045.217724-1-bruce.richardson@intel.com>
When producing a printable mac address the buffer was appropriately sized
for holding the mac address exactly, but the actual snprintf included a
'\n' character at the end, which means that the snprintf technically is
getting truncated i.e. the \n would not be added due to lack of space.
This gets flagged as a problem by modern versions of gcc, e.g. on Ubuntu
20.04.
main.c:77:37: warning: ‘__builtin___snprintf_chk’ output truncated before the last format character [-Wformat-truncation=]
77 | "%02x:%02x:%02x:%02x:%02x:%02x\n",
| ^
Since the \n is getting stripped anyway, we can fix the issue by just
removing it from the printf string.
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
examples/multi_process/client_server_mp/mp_server/main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/examples/multi_process/client_server_mp/mp_server/main.c b/examples/multi_process/client_server_mp/mp_server/main.c
index 280dab8672..af5af672c3 100644
--- a/examples/multi_process/client_server_mp/mp_server/main.c
+++ b/examples/multi_process/client_server_mp/mp_server/main.c
@@ -74,7 +74,7 @@ get_printable_mac_addr(uint16_t port)
return err_address;
}
snprintf(addresses[port], sizeof(addresses[port]),
- "%02x:%02x:%02x:%02x:%02x:%02x\n",
+ "%02x:%02x:%02x:%02x:%02x:%02x",
mac.addr_bytes[0], mac.addr_bytes[1], mac.addr_bytes[2],
mac.addr_bytes[3], mac.addr_bytes[4], mac.addr_bytes[5]);
}
--
2.25.1
next prev parent reply other threads:[~2020-08-14 11:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-14 11:00 [dpdk-dev] [PATCH 0/4] fixes for example app builds Bruce Richardson
2020-08-14 11:00 ` [dpdk-dev] [PATCH 1/4] power: make guest channel headers public Bruce Richardson
2020-08-14 11:05 ` Bruce Richardson
2020-08-14 11:00 ` [dpdk-dev] [PATCH 2/4] examples/vm_power_manager: fix string truncation warning Bruce Richardson
2020-08-14 11:00 ` Bruce Richardson [this message]
2020-08-14 15:01 ` [dpdk-dev] [PATCH 3/4] examples/mp_server: fix snprintf overflow Stephen Hemminger
2020-08-14 11:00 ` [dpdk-dev] [PATCH 4/4] examples/mp_server: clear string truncation warning Bruce Richardson
2020-08-21 17:10 ` [dpdk-dev] [PATCH v2 0/4] fixes for example app builds Bruce Richardson
2020-08-21 17:10 ` [dpdk-dev] [PATCH v2 1/4] power: make guest channel headers public Bruce Richardson
2020-08-26 10:08 ` David Hunt
2020-10-05 21:44 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2020-08-21 17:10 ` [dpdk-dev] [PATCH v2 2/4] examples/vm_power_manager: fix string truncation warning Bruce Richardson
2020-08-26 10:09 ` David Hunt
2020-08-21 17:10 ` [dpdk-dev] [PATCH v2 3/4] examples/mp_server: fix snprintf overflow Bruce Richardson
2020-10-09 11:22 ` Nicolau, Radu
2020-08-21 17:10 ` [dpdk-dev] [PATCH v2 4/4] examples/mp_server: clear string truncation warning Bruce Richardson
2020-10-09 11:21 ` Nicolau, Radu
2020-10-28 16:26 ` [dpdk-dev] [PATCH v3 0/3] fixes for example app builds Bruce Richardson
2020-10-28 16:27 ` [dpdk-dev] [PATCH v3 1/3] examples/vm_power_manager: fix string truncation warning Bruce Richardson
2020-10-28 16:27 ` [dpdk-dev] [PATCH v3 2/3] examples/mp_server: fix snprintf overflow Bruce Richardson
2020-10-28 16:27 ` [dpdk-dev] [PATCH v3 3/3] examples/mp_server: clear string truncation warning Bruce Richardson
2020-10-30 13:56 ` [dpdk-dev] [PATCH v3 0/3] fixes for example app builds David Marchand
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