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jump_label,module: Fix module lifetime for __jump_label_mod_text_reserved()

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Nothing ensures the module exists while we're iterating
mod->jump_entries in __jump_label_mod_text_reserved(), take a module
reference to ensure the module sticks around.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20200818135804.504501338@infradead.org
This commit is contained in:
Peter Zijlstra 2020-08-18 15:57:39 +02:00 committed by Ingo Molnar
parent 59cc8e0a90
commit 0db6e3734b
1 changed files with 8 additions and 2 deletions
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10
kernel/jump_label.c
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@ -539,19 +539,25 @@ static void static_key_set_mod(struct static_key *key,
static int __jump_label_mod_text_reserved(void *start, void *end)
{
struct module *mod;
int ret;
preempt_disable();
mod = __module_text_address((unsigned long)start);
WARN_ON_ONCE(__module_text_address((unsigned long)end) != mod);
if (!try_module_get(mod))
mod = NULL;
preempt_enable();
if (!mod)
return 0;
return __jump_label_text_reserved(mod->jump_entries,
ret = __jump_label_text_reserved(mod->jump_entries,
mod->jump_entries + mod->num_jump_entries,
start, end);
module_put(mod);
return ret;
}
static void __jump_label_mod_update(struct static_key *key)