From da7cd59ab9c8ed233df4809f6c8c90c636f676c7 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sat, 19 May 2007 14:51:00 +1000 Subject: [PATCH] [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 --- crypto/api.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/crypto/api.c b/crypto/api.c index 55af8bb0f05..33734fd9198 100644 --- a/crypto/api.c +++ b/crypto/api.c @@ -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); -- 2.20.1