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Koen Kooi
ebbeb55561
Also add script used to generate patches and SRC_URI Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
53 lines
1.9 KiB
Diff
53 lines
1.9 KiB
Diff
From 1a3341ff80be39daad523f56898e5dbba8a89452 Mon Sep 17 00:00:00 2001
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From: Jiang Liu <liuj97@gmail.com>
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Date: Fri, 3 Feb 2012 15:37:16 -0800
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Subject: [PATCH 23/87] kprobes: fix a memory leak in function
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pre_handler_kretprobe()
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commit 55ca6140e9bb307efc97a9301a4f501de02a6fd6 upstream.
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In function pre_handler_kretprobe(), the allocated kretprobe_instance
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object will get leaked if the entry_handler callback returns non-zero.
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This may cause all the preallocated kretprobe_instance objects exhausted.
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This issue can be reproduced by changing
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samples/kprobes/kretprobe_example.c to probe "mutex_unlock". And the fix
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is straightforward: just put the allocated kretprobe_instance object back
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onto the free_instances list.
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[akpm@linux-foundation.org: use raw_spin_lock/unlock]
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Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
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Acked-by: Jim Keniston <jkenisto@us.ibm.com>
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Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
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Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
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Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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Cc: "David S. Miller" <davem@davemloft.net>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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kernel/kprobes.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/kernel/kprobes.c b/kernel/kprobes.c
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index 52fd049..faa39d1 100644
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--- a/kernel/kprobes.c
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+++ b/kernel/kprobes.c
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@@ -1673,8 +1673,12 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
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ri->rp = rp;
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ri->task = current;
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- if (rp->entry_handler && rp->entry_handler(ri, regs))
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+ if (rp->entry_handler && rp->entry_handler(ri, regs)) {
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+ raw_spin_lock_irqsave(&rp->lock, flags);
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+ hlist_add_head(&ri->hlist, &rp->free_instances);
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+ raw_spin_unlock_irqrestore(&rp->lock, flags);
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return 0;
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+ }
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arch_prepare_kretprobe(ri, regs);
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--
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1.7.9.4
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