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

Greg Kroah-Hartman
2017-03-10T09:23:58Z

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)