Commit da7cd59a authored May 19, 2007 by Herbert Xu

[CRYPTO] api: Read module pointer before freeing algorithm



The function crypto_mod_put first frees the algorithm and then drops
the reference to its module.  Unfortunately we read the module pointer
which after freeing the algorithm and that pointer sits inside the
object that we just freed.

So this patch reads the module pointer out before we free the object.

Thanks to Luca Tettamanti for reporting this.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent 29059d12

crypto/api.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -48,8 +48,10 @@ EXPORT_SYMBOL_GPL(crypto_mod_get);

		void crypto_mod_put(struct crypto_alg *alg)
		{
		struct module *module = alg->cra_module;

		crypto_alg_put(alg);
		module_put(alg->cra_module);
		module_put(module);
		}
		EXPORT_SYMBOL_GPL(crypto_mod_put);