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Subject: media: atomisp: Fix buffer overrun in gmin_get_var_int()
Author:  Hans de Goede <hdego...@redhat.com>
Date:    Sat May 27 16:38:12 2023 +0100

Not all functions used in gmin_get_var_int() update len to the actual
length of the returned string. So len may still have its initial value
of the length of val[] when "val[len] = 0;" is run to ensure 0 termination.

If this happens we end up writing one beyond the bounds of val[], fix this.

Note this is a quick fix for this since the entirety of
atomisp_gmin_platform.c will be removed once all atomisp sensor
drivers have been moved over to runtime-pm + v4l2-async device
registration.

Closes: 
https://lore.kernel.org/linux-media/26f37e19-c240-4d77-831d-ef3f1a4dd51d@kili.mountain/

Reported-by: Dan Carpenter <dan.carpen...@linaro.org>
Signed-off-by: Hans de Goede <hdego...@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>

 drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

---

diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c 
b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
index 93bfb3fadcf7..139ad7ad1dcf 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
@@ -1429,8 +1429,8 @@ static int gmin_get_config_var(struct device *maindev,
 
 int gmin_get_var_int(struct device *dev, bool is_gmin, const char *var, int 
def)
 {
-       char val[CFG_VAR_NAME_MAX];
-       size_t len = sizeof(val);
+       char val[CFG_VAR_NAME_MAX + 1];
+       size_t len = CFG_VAR_NAME_MAX;
        long result;
        int ret;
 

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