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[Qemu-devel] [PATCH] io: some fixes to handling of /dev/null when runnin
From: |
Daniel P. Berrange |
Subject: |
[Qemu-devel] [PATCH] io: some fixes to handling of /dev/null when running commands |
Date: |
Mon, 11 Jan 2016 13:05:49 +0000 |
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.
Signed-off-by: Daniel P. Berrange <address@hidden>
---
io/channel-command.c | 22 ++++++++++++++++------
1 file 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;
--
2.5.0
- [Qemu-devel] [PATCH] io: some fixes to handling of /dev/null when running commands,
Daniel P. Berrange <=