From 79da7b914d310fa5a9649a0aa3e3537be39b7efc Mon Sep 17 00:00:00 2001 From: Gaetan Rivet Date: Thu, 3 Aug 2017 17:08:34 +0200 Subject: [PATCH 1/1] net/failsafe: fix blank line parsing When the output of an exec() slave definition is only a single newline character, the fail-safe currently fails to parse the device with the value returned by the rte_devargs library. This behavior is incorrect, because the fail-safe should make a difference between the absence of a device, and an erroneous device declaration. Fix the output sanitization in the case where no newline was at its end and detect the special case of an absent device. The correct error code is then returned. Fixes: a0194d828100 ("net/failsafe: add flexible device definition") Signed-off-by: Gaetan Rivet --- drivers/net/failsafe/failsafe_args.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/net/failsafe/failsafe_args.c b/drivers/net/failsafe/failsafe_args.c index 3f92a779f4..1f22416f04 100644 --- a/drivers/net/failsafe/failsafe_args.c +++ b/drivers/net/failsafe/failsafe_args.c @@ -101,10 +101,11 @@ fs_parse_device(struct sub_device *sdev, char *args) static void fs_sanitize_cmdline(char *args) { - size_t len; + char *nl; - len = strnlen(args, DEVARGS_MAXLEN); - args[len - 1] = '\0'; + nl = strrchr(args, '\n'); + if (nl) + nl[0] = '\0'; } static int @@ -149,6 +150,10 @@ fs_execute_cmd(struct sub_device *sdev, char *cmdline) goto ret_pclose; } fs_sanitize_cmdline(output); + if (output[0] == '\0') { + ret = -ENODEV; + goto ret_pclose; + } ret = fs_parse_device(sdev, output); if (ret) { ERROR("Parsing device '%s' failed", output); -- 2.20.1