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virnetsocket: Don't free virCommand in virNetSocketNewConnectCommand()

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The aim of virNetSocketNewConnectCommand() is to execute passed
command and attach socket pair/pipe to it so that client socket
can be opened (this is used for connections with alternative
transports, e.g. ssh). The virCommand is created in a caller and
then passed to virNetSocketNewConnectCommand() where it is freed
using virCommandFree(). This approach is wrong on two levels:

1) The deallocation happens on a different level than allocation,
2) There's a WIN32 stub that just reports an error and doesn't
   free the command.

However, with g_autoptr() trickery the command can be freed in
caller.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik 2021-10-15 13:39:36 +02:00
parent d9afe162ab
commit 44d8324f13
2 changed files with 6 additions and 7 deletions
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7
src/rpc/virnetsocket.c
View File

@ -821,8 +821,6 @@ int virNetSocketNewConnectCommand(virCommand *cmd,
if (!(*retsock = virNetSocketNew(NULL, NULL, true, sv[0], errfd[0], pid, false)))
goto error;
virCommandFree(cmd);
return 0;
error:
@ -832,7 +830,6 @@ int virNetSocketNewConnectCommand(virCommand *cmd,
VIR_FORCE_CLOSE(errfd[1]);
virCommandAbort(cmd);
virCommandFree(cmd);
return -1;
}
@ -856,7 +853,7 @@ int virNetSocketNewConnectSSH(const char *nodename,
const char *command,
virNetSocket **retsock)
{
virCommand *cmd;
g_autoptr(virCommand) cmd = NULL;
*retsock = NULL;
@ -1154,7 +1151,7 @@ virNetSocketNewConnectLibssh(const char *host G_GNUC_UNUSED,
int virNetSocketNewConnectExternal(const char **cmdargv,
virNetSocket **retsock)
{
virCommand *cmd;
g_autoptr(virCommand) cmd = NULL;
*retsock = NULL;

6
tests/virnetsockettest.c
View File

@ -388,7 +388,8 @@ static int testSocketCommandNormal(const void *data G_GNUC_UNUSED)
char buf[100];
size_t i;
int ret = -1;
virCommand *cmd = virCommandNewArgList("/bin/cat", "/dev/zero", NULL);
g_autoptr(virCommand) cmd = virCommandNewArgList("/bin/cat", "/dev/zero", NULL);
virCommandAddEnvPassCommon(cmd);
if (virNetSocketNewConnectCommand(cmd, &csock) < 0)
@ -415,7 +416,8 @@ static int testSocketCommandFail(const void *data G_GNUC_UNUSED)
virNetSocket *csock = NULL; /* Client socket */
char buf[100];
int ret = -1;
virCommand *cmd = virCommandNewArgList("/bin/cat", "/dev/does-not-exist", NULL);
g_autoptr(virCommand) cmd = virCommandNewArgList("/bin/cat", "/dev/does-not-exist", NULL);
virCommandAddEnvPassCommon(cmd);
if (virNetSocketNewConnectCommand(cmd, &csock) < 0)