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authorAnanth N Mavinakayanahalli <ananth@in.ibm.com>2006-04-20 05:43:11 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-20 10:54:03 -0400
commit7522a8423bed9931cbac5502b9c0657bde2700ea (patch)
tree8729269696269cba4ca477d711490a6c89c20cda /kernel/kprobes.c
parent5a7b46b369419493bab4de67b1526e9f76b22a7f (diff)
[PATCH] kprobes: NULL out non-relevant fields in struct kretprobe
In cases where a struct kretprobe's *_handler fields are non-NULL, it is possible to cause a system crash, due to the possibility of calls ending up in zombie functions. Documentation clearly states that unused *_handlers should be set to NULL, but kprobe users sometimes fail to do so. Fix it by setting the non-relevant fields of the struct kretprobe to NULL. Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Acked-by: Jim Keniston <jkenisto@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1156eb0977d0..1fbf466a29aa 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -585,6 +585,9 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
585 int i; 585 int i;
586 586
587 rp->kp.pre_handler = pre_handler_kretprobe; 587 rp->kp.pre_handler = pre_handler_kretprobe;
588 rp->kp.post_handler = NULL;
589 rp->kp.fault_handler = NULL;
590 rp->kp.break_handler = NULL;
588 591
589 /* Pre-allocate memory for max kretprobe instances */ 592 /* Pre-allocate memory for max kretprobe instances */
590 if (rp->maxactive <= 0) { 593 if (rp->maxactive <= 0) {