From a9f57cfc08810a0936bdc4f4766373a9802bca8e Mon Sep 17 00:00:00 2001 From: Bruce Richardson Date: Wed, 28 Oct 2020 16:27:00 +0000 Subject: [PATCH] examples/vm_power: fix build on Ubuntu 20.04 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When compiling on Ubuntu 20.04, a warning was issued about possible truncation of the path string for the power management socket. channel_manager.c: In function ‘add_all_channels’: channel_manager.c:470:41: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 90 [-Wformat-truncation=] 470 | sizeof(chan_info->channel_path), "%s%s", | ^~ This can be fixed by adding in an explicit truncation check to the code and handling it appropriately. Fixes: e8ae9b662506 ("examples/vm_power: channel manager and monitor in host") Cc: stable@dpdk.org Signed-off-by: Bruce Richardson Acked-by: David Hunt --- examples/vm_power_manager/channel_manager.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/examples/vm_power_manager/channel_manager.c b/examples/vm_power_manager/channel_manager.c index 74a2a677e8..a26315051b 100644 --- a/examples/vm_power_manager/channel_manager.c +++ b/examples/vm_power_manager/channel_manager.c @@ -467,9 +467,15 @@ add_all_channels(const char *vm_name) continue; } - snprintf(chan_info->channel_path, + if ((size_t)snprintf(chan_info->channel_path, sizeof(chan_info->channel_path), "%s%s", - CHANNEL_MGR_SOCKET_PATH, dir->d_name); + CHANNEL_MGR_SOCKET_PATH, dir->d_name) + >= sizeof(chan_info->channel_path)) { + RTE_LOG(ERR, CHANNEL_MANAGER, "Pathname too long for channel '%s%s'\n", + CHANNEL_MGR_SOCKET_PATH, dir->d_name); + rte_free(chan_info); + continue; + } if (setup_channel_info(&vm_info, &chan_info, channel_num) < 0) { rte_free(chan_info); -- 2.20.1