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[PATCH 4.9 119/153] remoteproc: qcom: mdt_loader: Dont overwrite firmware object

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  [PATCH 4.9 119/153] remoteproc: qcom: mdt_loader: Dont overwrite firmware object Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-10 12:00 +0100

#1597086 — [PATCH 4.9 119/153] remoteproc: qcom: mdt_loader: Dont overwrite firmware object

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bjorn Andersson <bjorn.andersson@linaro.org>

commit 3e8b571a9a0881ba3381ca0915995696da145ab8 upstream.

The "fw" firmware object is passed from the remoteproc core and should
not be overwritten, as that results in leaked buffers and a double free
of the the last firmware object.

Fixes: 051fb70fd4ea ("remoteproc: qcom: Driver for the self-authenticating Hexagon v5")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/remoteproc/qcom_mdt_loader.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/remoteproc/qcom_mdt_loader.c
+++ b/drivers/remoteproc/qcom_mdt_loader.c
@@ -115,6 +115,7 @@ int qcom_mdt_load(struct rproc *rproc,
 	const struct elf32_phdr *phdrs;
 	const struct elf32_phdr *phdr;
 	const struct elf32_hdr *ehdr;
+	const struct firmware *seg_fw;
 	size_t fw_name_len;
 	char *fw_name;
 	void *ptr;
@@ -153,16 +154,16 @@ int qcom_mdt_load(struct rproc *rproc,
 
 		if (phdr->p_filesz) {
 			sprintf(fw_name + fw_name_len - 3, "b%02d", i);
-			ret = request_firmware(&fw, fw_name, &rproc->dev);
+			ret = request_firmware(&seg_fw, fw_name, &rproc->dev);
 			if (ret) {
 				dev_err(&rproc->dev, "failed to load %s\n",
 					fw_name);
 				break;
 			}
 
-			memcpy(ptr, fw->data, fw->size);
+			memcpy(ptr, seg_fw->data, seg_fw->size);
 
-			release_firmware(fw);
+			release_firmware(seg_fw);
 		}
 
 		if (phdr->p_memsz > phdr->p_filesz)

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