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udev: event - check return code of dup2()

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This fixes CID#1304688.
This commit is contained in:
Tom Gundersen 2015-06-23 17:03:19 +02:00
parent e448a1c3a3
commit f6e0a35376
1 changed files with 28 additions and 10 deletions
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38
src/udev/udev-event.c
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@ -389,26 +389,44 @@ static int spawn_exec(struct udev_event *event,
const char *cmd, char *const argv[], char **envp,
int fd_stdout, int fd_stderr) {
_cleanup_close_ int fd = -1;
int r;
/* discard child output or connect to pipe */
fd = open("/dev/null", O_RDWR);
if (fd >= 0) {
dup2(fd, STDIN_FILENO);
if (fd_stdout < 0)
dup2(fd, STDOUT_FILENO);
if (fd_stderr < 0)
dup2(fd, STDERR_FILENO);
r = dup2(fd, STDIN_FILENO);
if (r < 0)
log_warning_errno(errno, "redirecting stdin failed: %m");
if (fd_stdout < 0) {
r = dup2(fd, STDOUT_FILENO);
if (r < 0)
log_warning_errno(errno, "redirecting stdout failed: %m");
}
if (fd_stderr < 0) {
r = dup2(fd, STDERR_FILENO);
if (r < 0)
log_warning_errno(errno, "redirecting stderr failed: %m");
}
} else
log_error_errno(errno, "open /dev/null failed: %m");
log_warning_errno(errno, "open /dev/null failed: %m");
/* connect pipes to std{out,err} */
if (fd_stdout >= 0) {
dup2(fd_stdout, STDOUT_FILENO);
safe_close(fd_stdout);
r = dup2(fd_stdout, STDOUT_FILENO);
if (r < 0)
log_warning_errno(errno, "redirecting stdout failed: %m");
fd_stdout = safe_close(fd_stdout);
}
if (fd_stderr >= 0) {
dup2(fd_stderr, STDERR_FILENO);
safe_close(fd_stderr);
r = dup2(fd_stderr, STDERR_FILENO);
if (r < 0)
log_warning_errno(errno, "redirecting stdout failed: %m");
fd_stderr = safe_close(fd_stderr);
}
/* terminate child in case parent goes away */