diff options
author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-08-29 15:28:39 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-03 09:39:10 +0200 |
commit | 329101244f214952606359d254ae883b7109e1a5 (patch) | |
tree | 338dd3afc11bf09b6e1738a5443bec8b4e54aaac /drivers | |
parent | 20738057210365bbcd8a718c04ded6c93a262b95 (diff) | |
download | linux-329101244f214952606359d254ae883b7109e1a5.tar.bz2 |
staging: greybus: light: fix a couple double frees
The problem is in gb_lights_request_handler(). If we get a request to
change the config then we release the light with gb_lights_light_release()
and re-allocated it. However, if the allocation fails part way through
then we call gb_lights_light_release() again. This can lead to a couple
different double frees where we haven't cleared out the original values:
gb_lights_light_v4l2_unregister(light);
...
kfree(light->channels);
kfree(light->name);
I also made a small change to how we set "light->channels_count = 0;".
The original code handled this part fine and did not cause a use after
free but it was sort of complicated to read.
Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Link: https://lore.kernel.org/r/20190829122839.GA20116@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/staging/greybus/light.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c index b3b1b253d112..d6ba25f21d80 100644 --- a/drivers/staging/greybus/light.c +++ b/drivers/staging/greybus/light.c @@ -1096,21 +1096,21 @@ static void gb_lights_channel_release(struct gb_channel *channel) static void gb_lights_light_release(struct gb_light *light) { int i; - int count; light->ready = false; - count = light->channels_count; - if (light->has_flash) gb_lights_light_v4l2_unregister(light); + light->has_flash = false; - for (i = 0; i < count; i++) { + for (i = 0; i < light->channels_count; i++) gb_lights_channel_release(&light->channels[i]); - light->channels_count--; - } + light->channels_count = 0; + kfree(light->channels); + light->channels = NULL; kfree(light->name); + light->name = NULL; } static void gb_lights_release(struct gb_lights *glights) |