On Wed 22 Jul 13:10 PDT 2020, Sibi Sankar wrote:

The following mem abort is observed when one of the modem blob firmware size exceeds the allocated mpss region. Fix this by restricting the copy size to segment size using request_firmware_into_buf before load.

Err Logs: Unable to handle kernel paging request at virtual address Mem abort info: ... Call trace: __memcpy+0x110/0x180 rproc_start+0xd0/0x190 rproc_boot+0x404/0x550 state_store+0x54/0xf8 dev_attr_store+0x44/0x60 sysfs_kf_write+0x58/0x80 kernfs_fop_write+0x140/0x230 vfs_write+0xc4/0x208 ksys_write+0x74/0xf8 ...

Fixes: 051fb70fd4ea4 ("remoteproc: qcom: Driver for the self-authenticating Hexagon v5") Cc: stable@vger.kernel.org Signed-off-by: Sibi Sankar sibis@codeaurora.org

Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org

---

drivers/remoteproc/qcom_q6v5_mss.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c index 4e72c9e30426c..f4aa61ba220dc 100644 --- a/drivers/remoteproc/qcom_q6v5_mss.c +++ b/drivers/remoteproc/qcom_q6v5_mss.c @@ -1174,15 +1174,14 @@ static int q6v5_mpss_load(struct q6v5 *qproc) } else if (phdr->p_filesz) { /* Replace "xxx.xxx" with "xxx.bxx" */ sprintf(fw_name + fw_name_len - 3, "b%02d", i);

• 	ret = request_firmware(&seg_fw, fw_name, qproc->dev);
  

• 	ret = request_firmware_into_buf(&seg_fw, fw_name, qproc->dev,
  

• 					ptr, phdr->p_filesz);
  if (ret) {
  	dev_err(qproc->dev, "failed to load %s\n", fw_name);
  	iounmap(ptr);
  	goto release_firmware;
  }
  

• 	memcpy(ptr, seg_fw->data, seg_fw->size);
  

• release_firmware(seg_fw);
  

  }

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