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c70dbb1e79
There is memleak in alloc_pid:
------------------------------
unreferenced object 0xd3453a80 (size 64):
comm "adbd", pid 1730, jiffies 66363 (age 6586.950s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 40 c2 f6 d5 00 d3 25 c1 59 28 00 00 ....@.....%.Y(..
backtrace:
[<c1a6f15c>] kmemleak_alloc+0x3c/0xa0
[<c1320546>] kmem_cache_alloc+0xc6/0x190
[<c125d51e>] alloc_pid+0x1e/0x400
[<c123d344>] copy_process.part.39+0xad4/0x1120
[<c123da59>] do_fork+0x99/0x330
[<c123dd58>] sys_fork+0x28/0x30
[<c1a89a08>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
the leak is due to unreleased pid->count, which execute in function:
get_pid()(pid->count++) and put_pid()(pid->count--).
The race condition as following:
task[dumpsys] task[adbd]
in disassociate_ctty() in tty_signal_session_leader()
----------------------- -------------------------
tty = get_current_tty();
// tty is not NULL
...
spin_lock_irq(¤t->sighand->siglock);
put_pid(current->signal->tty_old_pgrp);
current->signal->tty_old_pgrp = NULL;
spin_unlock_irq(¤t->sighand->siglock);
spin_lock_irq(&p->sighand->siglock);
...
p->signal->tty = NULL;
...
spin_unlock_irq(&p->sighand->siglock);
tty = get_current_tty();
// tty NULL, goto else branch by accident.
if (tty) {
...
put_pid(tty_session);
put_pid(tty_pgrp);
...
} else {
print msg
}
in task[dumpsys], in disassociate_ctty(), tty is set NULL by task[adbd],
tty_signal_session_leader(), then it goto else branch and lack of
put_pid(), cause memleak.
move spin_unlock(sighand->siglock) after get_current_tty() can avoid
the race and fix the memleak.
Signed-off-by: Zhang Jun <jun.zhang@intel.com>
Signed-off-by: Chen Tingjie <tingjie.chen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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| .. | ||
| hvc | ||
| ipwireless | ||
| serial | ||
| vt | ||
| amiserial.c | ||
| bfin_jtag_comm.c | ||
| cyclades.c | ||
| ehv_bytechan.c | ||
| goldfish.c | ||
| isicom.c | ||
| Kconfig | ||
| Makefile | ||
| metag_da.c | ||
| moxa.c | ||
| moxa.h | ||
| mxser.c | ||
| mxser.h | ||
| n_gsm.c | ||
| n_hdlc.c | ||
| n_r3964.c | ||
| n_tracerouter.c | ||
| n_tracesink.c | ||
| n_tracesink.h | ||
| n_tty.c | ||
| nozomi.c | ||
| pty.c | ||
| rocket_int.h | ||
| rocket.c | ||
| rocket.h | ||
| synclink_gt.c | ||
| synclink.c | ||
| synclinkmp.c | ||
| sysrq.c | ||
| tty_audit.c | ||
| tty_buffer.c | ||
| tty_io.c | ||
| tty_ioctl.c | ||
| tty_ldisc.c | ||
| tty_ldsem.c | ||
| tty_mutex.c | ||
| tty_port.c | ||