media: atomisp2: array underflow in imx_enum_frame_size()

The code looks in imx_enum_frame_size() looks like this:

  2066          int index = fse->index;
  2067          struct imx_device *dev = to_imx_sensor(sd);
  2068
  2069          mutex_lock(&dev->input_lock);
  2070          if (index >= dev->entries_curr_table) {
  2071                  mutex_unlock(&dev->input_lock);
  2072                  return -EINVAL;
  2073          }
  2074
  2075          fse->min_width = dev->curr_res_table[index].width;

"fse->index" is a u32 that comes from the user.  We want negative values
of "index" to be -EINVAL so we don't read before the start of the
dev->curr_res_table[] array.  I've made "entries_curr_table" unsigned
long to fix this.  I thought about making it unsigned int, but because
of struct alignment, it doesn't use more memory either way.

Fixes: a49d25364dfb ("staging/atomisp: Add support for the Intel IPU v2")

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/staging/media/atomisp/i2c/imx/imx.h b/drivers/staging/media/atomisp/i2c/imx/imx.h
index 36b3f3a..41b4133 100644 (file)
--- a/drivers/staging/media/atomisp/i2c/imx/imx.h
+++ b/drivers/staging/media/atomisp/i2c/imx/imx.h
@@ -480,7 +480,7 @@ struct imx_device {
        struct imx_vcm *vcm_driver;
        struct imx_otp *otp_driver;
        const struct imx_resolution *curr_res_table;
-       int entries_curr_table;
+       unsigned long entries_curr_table;
        const struct firmware *fw;
        struct imx_reg_addr *reg_addr;
        const struct imx_reg *param_hold;

diff --git a/drivers/staging/media/atomisp/i2c/ov8858.h b/drivers/staging/media/atomisp/i2c/ov8858.h
index 9be6a0e..d3fde20 100644 (file)
--- a/drivers/staging/media/atomisp/i2c/ov8858.h
+++ b/drivers/staging/media/atomisp/i2c/ov8858.h
@@ -266,7 +266,7 @@ struct ov8858_device {
        const struct ov8858_reg *regs;
        struct ov8858_vcm *vcm_driver;
        const struct ov8858_resolution *curr_res_table;
-       int entries_curr_table;
+       unsigned long entries_curr_table;
 
        struct v4l2_ctrl_handler ctrl_handler;
        struct v4l2_ctrl *run_mode;

diff --git a/drivers/staging/media/atomisp/i2c/ov8858_btns.h b/drivers/staging/media/atomisp/i2c/ov8858_btns.h
index 09e3cdc..f9a3cf8 100644 (file)
--- a/drivers/staging/media/atomisp/i2c/ov8858_btns.h
+++ b/drivers/staging/media/atomisp/i2c/ov8858_btns.h
@@ -266,7 +266,7 @@ struct ov8858_device {
        const struct ov8858_reg *regs;
        struct ov8858_vcm *vcm_driver;
        const struct ov8858_resolution *curr_res_table;
-       int entries_curr_table;
+       unsigned long entries_curr_table;
 
        struct v4l2_ctrl_handler ctrl_handler;
        struct v4l2_ctrl *run_mode;