From 26c98ec94d7aa6d5d3fe6c3fccc78b26a2bf11d4 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Sat, 3 Dec 2016 09:34:45 -0800 Subject: [PATCH] sys: Check return values of chdir and write Fixes the following warnings: rpcd/sys.c: In function 'rpc_cgi_password_set': rpcd/sys.c:116:8: error: ignoring return value of 'chdir', declared with attribute warn_unused_result [-Werror=unused-result] chdir("/"); ^ rpcd/sys.c:125:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result] write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]), ^ rpcd/sys.c:127:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result] write(fds[1], "\n", 1); ^ rpcd/sys.c:131:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result] write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]), ^ rpcd/sys.c:133:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result] write(fds[1], "\n", 1); ^ cc1: all warnings being treated as errors Signed-off-by: Florian Fainelli --- sys.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/sys.c b/sys.c index b90aa6b..3691dfb 100644 --- a/sys.c +++ b/sys.c @@ -76,6 +76,8 @@ rpc_cgi_password_set(struct ubus_context *ctx, struct ubus_object *obj, int fd, fds[2]; struct stat s; struct blob_attr *tb[__RPC_P_MAX]; + ssize_t n; + int ret; blobmsg_parse(rpc_password_policy, __RPC_P_MAX, tb, blob_data(msg), blob_len(msg)); @@ -113,7 +115,9 @@ rpc_cgi_password_set(struct ubus_context *ctx, struct ubus_object *obj, close(fd); } - chdir("/"); + ret = chdir("/"); + if (ret < 0) + return rpc_errno_status(); if (execl("/usr/bin/passwd", "/usr/bin/passwd", blobmsg_data(tb[RPC_P_USER]), NULL)) @@ -122,15 +126,24 @@ rpc_cgi_password_set(struct ubus_context *ctx, struct ubus_object *obj, default: close(fds[0]); - write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]), + n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]), blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1); - write(fds[1], "\n", 1); + if (n < 0) + return rpc_errno_status(); + + n = write(fds[1], "\n", 1); + if (n < 0) + return rpc_errno_status(); usleep(100 * 1000); - write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]), + n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]), blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1); - write(fds[1], "\n", 1); + if (n < 0) + return rpc_errno_status(); + n = write(fds[1], "\n", 1); + if (n < 0) + return rpc_errno_status(); close(fds[1]); -- 2.30.2