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[PATCH] kprobes: NULL out non-relevant fields in struct kretprobe

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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>
This commit is contained in:
Ananth N Mavinakayanahalli 2006-04-20 02:43:11 -07:00 committed by Linus Torvalds
parent 5a7b46b369
commit 7522a8423b
1 changed files with 3 additions and 0 deletions
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3
kernel/kprobes.c
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@ -585,6 +585,9 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
int i; int i;
rp->kp.pre_handler = pre_handler_kretprobe; rp->kp.pre_handler = pre_handler_kretprobe;
rp->kp.post_handler = NULL;
rp->kp.fault_handler = NULL;
rp->kp.break_handler = NULL;
/* Pre-allocate memory for max kretprobe instances */ /* Pre-allocate memory for max kretprobe instances */
if (rp->maxactive <= 0) { if (rp->maxactive <= 0) {