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drm/brige/megachips: Add checking if ge_b850v3_lvds_init() is working correctly

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If ge_b850v3_lvds_init() does not allocate memory for ge_b850v3_lvds_ptr,
then a null pointer dereference is accessed.

The patch adds checking of the return value of ge_b850v3_lvds_init().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200819143756.30626-1-lutovinova@ispras.ru
This commit is contained in:
Nadezda Lutovinova 2020-08-19 17:37:56 +03:00 committed by Sam Ravnborg
parent 7f7fb53f62
commit f688a345f0
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
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@ -310,8 +310,12 @@ static int stdp4028_ge_b850v3_fw_probe(struct i2c_client *stdp4028_i2c,
const struct i2c_device_id *id)
{
struct device *dev = &stdp4028_i2c->dev;
int ret;
ge_b850v3_lvds_init(dev);
ret = ge_b850v3_lvds_init(dev);
if (ret)
return ret;
ge_b850v3_lvds_ptr->stdp4028_i2c = stdp4028_i2c;
i2c_set_clientdata(stdp4028_i2c, ge_b850v3_lvds_ptr);
@ -372,8 +376,12 @@ static int stdp2690_ge_b850v3_fw_probe(struct i2c_client *stdp2690_i2c,
const struct i2c_device_id *id)
{
struct device *dev = &stdp2690_i2c->dev;
int ret;
ge_b850v3_lvds_init(dev);
ret = ge_b850v3_lvds_init(dev);
if (ret)
return ret;
ge_b850v3_lvds_ptr->stdp2690_i2c = stdp2690_i2c;
i2c_set_clientdata(stdp2690_i2c, ge_b850v3_lvds_ptr);