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authorGustavo A. R. Silva <garsilva@embeddedor.com>2017-12-06 14:20:15 -0600
committerMyungJoo Ham <myungjoo.ham@samsung.com>2018-01-02 09:36:54 +0900
commit63f1e05f7fe9ca509c60154d6a833abf96eecdc9 (patch)
treec7166465e745e3d073bf07b578bff73cd28394a8 /drivers/devfreq
parentd1bf2d30728f310f72296b54f0651ecdb09cbb12 (diff)
PM / devfreq: Fix potential NULL pointer dereference in governor_store
df->governor is being dereferenced before it is null checked, hence there is a potential null pointer dereference. Notice that df->governor is being null checked at line 1004: if (df->governor) {, which implies it might be null. Fix this by null checking df->governor before dereferencing it. Addresses-Coverity-ID: 1401988 ("Dereference before null check") Fixes: bcf23c79c4e4 ("PM / devfreq: Fix available_governor sysfs") Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/devfreq.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 99c4021fc33b..fe2af6aa88fc 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -996,7 +996,8 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
if (df->governor == governor) {
ret = 0;
goto out;
- } else if (df->governor->immutable || governor->immutable) {
+ } else if ((df->governor && df->governor->immutable) ||
+ governor->immutable) {
ret = -EINVAL;
goto out;
}

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