diff options
| author | Jiang Liu <liuj97@gmail.com> | 2012-02-03 15:37:16 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-13 11:06:06 -0800 |
| commit | 603b63484725a6e88e4ae5da58716efd88154b1e (patch) | |
| tree | 60749779f5d0425c12455805280fe4dbff1ab955 /kernel/kprobes.c | |
| parent | 55d9f089521b1355cdd6914d1186ae02ddc0f74f (diff) | |
kprobes: fix a memory leak in function pre_handler_kretprobe()
commit 55ca6140e9bb307efc97a9301a4f501de02a6fd6 upstream.
In function pre_handler_kretprobe(), the allocated kretprobe_instance
object will get leaked if the entry_handler callback returns non-zero.
This may cause all the preallocated kretprobe_instance objects exhausted.
This issue can be reproduced by changing
samples/kprobes/kretprobe_example.c to probe "mutex_unlock". And the fix
is straightforward: just put the allocated kretprobe_instance object back
onto the free_instances list.
[akpm@linux-foundation.org: use raw_spin_lock/unlock]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Jim Keniston <jkenisto@us.ibm.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/kprobes.c')
| -rw-r--r-- | kernel/kprobes.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index e0f0bdd92ca..749340c1e6f 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1660,8 +1660,12 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p, ri->rp = rp; ri->task = current; - if (rp->entry_handler && rp->entry_handler(ri, regs)) + if (rp->entry_handler && rp->entry_handler(ri, regs)) { + raw_spin_lock_irqsave(&rp->lock, flags); + hlist_add_head(&ri->hlist, &rp->free_instances); + raw_spin_unlock_irqrestore(&rp->lock, flags); return 0; + } arch_prepare_kretprobe(ri, regs); |