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authorAkiyama, Nobuyuki <akiyama.nobuyuk@jp.fujitsu.com>2008-07-17 11:22:01 -0700
committerTony Luck <tony.luck@intel.com>2008-07-17 11:22:01 -0700
commit740a8de0796dd12890b3c8ddcfabfcb528b78d40 (patch)
treeb9ae53a096b7ea3216c04009c9c085015115b96b
parent60192db82952ad56ef7bbc4a318e2041ca65ba7d (diff)
[IA64] adding parameter check to module_free()
module_free() refers the first parameter before checking. But it is called like below(in kernel/kprobes). The first parameter is always NULL. This happens when many probe points(>1024) are set by kprobes. I encountered this with using SystemTap. It can set many probes easily. static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx) { ... if (kip->nused == 0) { hlist_del(&kip->hlist); if (hlist_empty(&kprobe_insn_pages)) { ... } else { module_free(NULL, kip->insns); //<<< 1st param always NULL kfree(kip); } return 1; } return 0; } Signed-off-by: Akiyama, Nobuyuki <akiyama.nobuyuk@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r--arch/ia64/kernel/module.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index e83e2ea3b3e..29aad349e0c 100644
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -321,7 +321,8 @@ module_alloc (unsigned long size)
void
module_free (struct module *mod, void *module_region)
{
- if (mod->arch.init_unw_table && module_region == mod->module_init) {
+ if (mod && mod->arch.init_unw_table &&
+ module_region == mod->module_init) {
unw_remove_unwind_table(mod->arch.init_unw_table);
mod->arch.init_unw_table = NULL;
}