linux-kernel - Re: [PATCH v2 2/2] crypto: qat - fix resource release omissions

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Date:   Tue, 6 Sep 2016 11:18:51 +0100
From:   Giovanni Cabiddu <giovanni.cabiddu@...el.com>
To:     Quentin Lambert <lambert.quentin@...il.com>
Cc:     Salvatore Benedetto <salvatore.benedetto@...el.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>, qat-linux@...el.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, giovanni.cabiddu@...il.com,
        giovanni.cabiddu@...el.com
Subject: Re: [PATCH v2 2/2] crypto: qat - fix resource release omissions

Hi Lambert,

On Fri, Sep 02, 2016 at 04:47:53PM +0200, Quentin Lambert wrote:
> In certain cases qat_uclo_parse_uof_obj used to return with an error code
> before releasing all resources. This patch add a jump to the appropriate label
> ensuring that the resources are properly released before returning.
> 
> This issue was found with Hector.
Thanks for the patches. This can be easily fixed by moving the kcalloc after 
the compatibility check function. What do you think?

---8<---
Subject: [PATCH] crypto: qat - fix leak on error path

Fix a memory leak in an error path in uc loader.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@...el.com>
---
 drivers/crypto/qat/qat_common/qat_uclo.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/qat/qat_common/qat_uclo.c b/drivers/crypto/qat/qat_common/qat_uclo.c
index 9b961b3..e2454d9 100644
--- a/drivers/crypto/qat/qat_common/qat_uclo.c
+++ b/drivers/crypto/qat/qat_common/qat_uclo.c
@@ -967,10 +967,6 @@ static int qat_uclo_parse_uof_obj(struct icp_qat_fw_loader_handle *handle)
 	struct icp_qat_uclo_objhandle *obj_handle = handle->obj_handle;
 	unsigned int ae;
 
-	obj_handle->uword_buf = kcalloc(UWORD_CPYBUF_SIZE, sizeof(uint64_t),
-					GFP_KERNEL);
-	if (!obj_handle->uword_buf)
-		return -ENOMEM;
 	obj_handle->encap_uof_obj.beg_uof = obj_handle->obj_hdr->file_buff;
 	obj_handle->encap_uof_obj.obj_hdr = (struct icp_qat_uof_objhdr *)
 					     obj_handle->obj_hdr->file_buff;
@@ -982,6 +978,10 @@ static int qat_uclo_parse_uof_obj(struct icp_qat_fw_loader_handle *handle)
 		pr_err("QAT: UOF incompatible\n");
 		return -EINVAL;
 	}
+	obj_handle->uword_buf = kcalloc(UWORD_CPYBUF_SIZE, sizeof(uint64_t),
+					GFP_KERNEL);
+	if (!obj_handle->uword_buf)
+		return -ENOMEM;
 	obj_handle->ustore_phy_size = ICP_QAT_UCLO_MAX_USTORE;
 	if (!obj_handle->obj_hdr->file_buff ||
 	    !qat_uclo_map_str_table(obj_handle->obj_hdr, ICP_QAT_UOF_STRT,
--