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[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>
hifive-unleashed-5.1
Akiyama, Nobuyuki 2008-07-17 11:22:01 -07:00 committed by Tony Luck
parent 60192db829
commit 740a8de079
1 changed files with 2 additions and 1 deletions
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3
arch/ia64/kernel/module.c
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@ -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;
}