From 4e3a61c55b8c5db9bfaaf1fc1f448f8f874f66eb Mon Sep 17 00:00:00 2001 From: Iuliana Prodan Date: Wed, 31 Jul 2019 16:08:13 +0300 Subject: [PATCH] crypto: caam - execute module exit point only if necessary Commit 1b46c90c8e00 ("crypto: caam - convert top level drivers to libraries") changed entry and exit points behavior for caamalg, caamalg_qi, caamalg_qi2, caamhash, caampkc, caamrng. For example, previously caam_pkc_init() and caam_pkc_exit() were module entry/exit points. This means that if an error would happen in caam_pkc_init(), then caam_pkc_exit() wouldn't have been called. After the mentioned commit, caam_pkc_init() and caam_pkc_exit() are manually called - from jr.c. caam_pkc_exit() is called unconditionally, even if caam_pkc_init() failed. Added a global variable to keep the status of the algorithm registration and free of resources. The exit point of caampkc/caamrng module is executed only if the registration was successful. Therefore we avoid double free of resources in case the algorithm registration failed. Fixes: 1b46c90c8e00 ("crypto: caam - convert top level drivers to libraries") Signed-off-by: Iuliana Prodan Reviewed-by: Horia Geanta Signed-off-by: Herbert Xu --- drivers/crypto/caam/caampkc.c | 11 +++++++++++ drivers/crypto/caam/caamrng.c | 14 +++++++++++++- 2 files changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c index e05d975da582..e00a4701b950 100644 --- a/drivers/crypto/caam/caampkc.c +++ b/drivers/crypto/caam/caampkc.c @@ -29,6 +29,12 @@ /* buffer filled with zeros, used for padding */ static u8 *zero_buffer; +/* + * variable used to avoid double free of resources in case + * algorithm registration was unsuccessful + */ +static bool init_done; + static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc, struct akcipher_request *req) { @@ -1076,6 +1082,7 @@ int caam_pkc_init(struct device *ctrldev) struct caam_drv_private *priv = dev_get_drvdata(ctrldev); u32 pk_inst; int err; + init_done = false; /* Determine public key hardware accelerator presence. */ if (priv->era < 10) @@ -1100,6 +1107,7 @@ int caam_pkc_init(struct device *ctrldev) dev_warn(ctrldev, "%s alg registration failed\n", caam_rsa.base.cra_driver_name); } else { + init_done = true; dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n"); } @@ -1108,6 +1116,9 @@ int caam_pkc_init(struct device *ctrldev) void caam_pkc_exit(void) { + if (!init_done) + return; + kfree(zero_buffer); crypto_unregister_akcipher(&caam_rsa); } diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c index 54c32d53760c..7fbda1b08360 100644 --- a/drivers/crypto/caam/caamrng.c +++ b/drivers/crypto/caam/caamrng.c @@ -80,6 +80,12 @@ struct caam_rng_ctx { static struct caam_rng_ctx *rng_ctx; +/* + * Variable used to avoid double free of resources in case + * algorithm registration was unsuccessful + */ +static bool init_done; + static inline void rng_unmap_buf(struct device *jrdev, struct buf_data *bd) { if (bd->addr) @@ -296,6 +302,9 @@ static struct hwrng caam_rng = { void caam_rng_exit(void) { + if (!init_done) + return; + caam_jr_free(rng_ctx->jrdev); hwrng_unregister(&caam_rng); kfree(rng_ctx); @@ -307,6 +316,7 @@ int caam_rng_init(struct device *ctrldev) u32 rng_inst; struct caam_drv_private *priv = dev_get_drvdata(ctrldev); int err; + init_done = false; /* Check for an instantiated RNG before registration */ if (priv->era < 10) @@ -335,8 +345,10 @@ int caam_rng_init(struct device *ctrldev) dev_info(dev, "registering rng-caam\n"); err = hwrng_register(&caam_rng); - if (!err) + if (!err) { + init_done = true; return err; + } free_rng_ctx: kfree(rng_ctx); -- 2.11.0