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lib/error-inject: traverse list with mutex

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Traversing list without mutex in get_injectable_error_type will
race with the following code:
    list_del_init(&ent->list)
    kfree(ent)
in module_unload_ei_list. So fix that.

Link: https://lkml.kernel.org/r/20220620100244.82896-1-wuchi.zero@gmail.com
Signed-off-by: wuchi <wuchi.zero@gmail.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
wuchi 2022-06-20 18:02:44 +08:00 committed by akpm
parent f9987921cb
commit 86e5908ec2
1 changed files with 9 additions and 3 deletions
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12
lib/error-inject.c
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@ -40,12 +40,18 @@ bool within_error_injection_list(unsigned long addr)
int get_injectable_error_type(unsigned long addr)
{
struct ei_entry *ent;
int ei_type = EI_ETYPE_NONE;
mutex_lock(&ei_mutex);
list_for_each_entry(ent, &error_injection_list, list) {
if (addr >= ent->start_addr && addr < ent->end_addr)
return ent->etype;
if (addr >= ent->start_addr && addr < ent->end_addr) {
ei_type = ent->etype;
break;
}
}
return EI_ETYPE_NONE;
mutex_unlock(&ei_mutex);
return ei_type;
}
/*