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Prevent multiple shells being spawned

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Existing shells would be leaked.
The old check only caught multiple commands, not shells.
This commit is contained in:
Matt Johnston 2021-03-06 23:06:43 +08:00
parent 6c571c54e5
commit 67a8de30b7
1 changed files with 7 additions and 2 deletions
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9
svr-chansession.c
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@ -658,12 +658,13 @@ static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
unsigned int cmdlen = 0;
int ret;
TRACE(("enter sessioncommand"))
TRACE(("enter sessioncommand %d", channel->index))
if (chansess->cmd != NULL) {
if (chansess->pid != 0) {
/* Note that only one command can _succeed_. The client might try
* one command (which fails), then try another. Ie fallback
* from sftp to scp */
TRACE(("leave sessioncommand, already have a command"))
return DROPBEAR_FAILURE;
}
@ -675,6 +676,7 @@ static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
if (cmdlen > MAX_CMD_LEN) {
m_free(chansess->cmd);
/* TODO - send error - too long ? */
TRACE(("leave sessioncommand, command too long %d", cmdlen))
return DROPBEAR_FAILURE;
}
}
@ -687,6 +689,7 @@ static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
#endif
{
m_free(chansess->cmd);
TRACE(("leave sessioncommand, unknown subsystem"))
return DROPBEAR_FAILURE;
}
}
@ -743,6 +746,7 @@ static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
if (ret == DROPBEAR_FAILURE) {
m_free(chansess->cmd);
}
TRACE(("leave sessioncommand, ret %d", ret))
return ret;
}
@ -916,6 +920,7 @@ static void addchildpid(struct ChanSess *chansess, pid_t pid) {
svr_ses.childpidsize++;
}
TRACE(("addchildpid %d pid %d for chansess %p", i, pid, chansess))
svr_ses.childpids[i].pid = pid;
svr_ses.childpids[i].chansess = chansess;