diff options
author | Daniel P. Berrange <berrange@redhat.com> | 2016-01-11 13:02:16 +0000 |
---|---|---|
committer | Timothy Pearson <tpearson@raptorengineering.com> | 2019-11-29 19:28:25 -0600 |
commit | b276437569dcd7d43f1fff5eb9148308dfaa8d2f (patch) | |
tree | 720162ebd492f8fd0161559da04f07d5d28fccd2 /io/channel-command.c | |
parent | d9b2bf710715b620f24c1b8507c13e22653317ea (diff) | |
download | hqemu-b276437569dcd7d43f1fff5eb9148308dfaa8d2f.zip hqemu-b276437569dcd7d43f1fff5eb9148308dfaa8d2f.tar.gz |
io: some fixes to handling of /dev/null when running commands
The /dev/null file handle was leaked in a couple of places.
There is also the possibility that both readfd and writefd
point to the same /dev/null file handle, so care must be
taken not to close the same file handle twice.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'io/channel-command.c')
-rw-r--r-- | io/channel-command.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/io/channel-command.c b/io/channel-command.c index a220fe8..a9c67aa 100644 --- a/io/channel-command.c +++ b/io/channel-command.c @@ -66,7 +66,7 @@ qio_channel_command_new_spawn(const char *const argv[], if (stdinnull || stdoutnull) { devnull = open("/dev/null", O_RDWR); - if (!devnull) { + if (devnull < 0) { error_setg_errno(errp, errno, "Unable to open /dev/null"); goto error; @@ -98,6 +98,9 @@ qio_channel_command_new_spawn(const char *const argv[], close(stdoutfd[0]); close(stdoutfd[1]); } + if (devnull != -1) { + close(devnull); + } execv(argv[0], (char * const *)argv); _exit(1); @@ -117,6 +120,9 @@ qio_channel_command_new_spawn(const char *const argv[], return ioc; error: + if (devnull != -1) { + close(devnull); + } if (stdinfd[0] != -1) { close(stdinfd[0]); } @@ -202,12 +208,12 @@ static void qio_channel_command_finalize(Object *obj) QIOChannelCommand *ioc = QIO_CHANNEL_COMMAND(obj); if (ioc->readfd != -1) { close(ioc->readfd); - ioc->readfd = -1; } - if (ioc->writefd != -1) { + if (ioc->writefd != -1 && + ioc->writefd != ioc->readfd) { close(ioc->writefd); - ioc->writefd = -1; } + ioc->writefd = ioc->readfd = -1; if (ioc->pid > 0) { #ifndef WIN32 qio_channel_command_abort(ioc, NULL); @@ -299,12 +305,16 @@ static int qio_channel_command_close(QIOChannel *ioc, /* We close FDs before killing, because that * gives a better chance of clean shutdown */ - if (close(cioc->writefd) < 0) { + if (cioc->readfd != -1 && + close(cioc->readfd) < 0) { rv = -1; } - if (close(cioc->readfd) < 0) { + if (cioc->writefd != -1 && + cioc->writefd != cioc->readfd && + close(cioc->writefd) < 0) { rv = -1; } + cioc->writefd = cioc->readfd = -1; #ifndef WIN32 if (qio_channel_command_abort(cioc, errp) < 0) { return -1; |