This patch fixes the following Smatch warning in zram_drv.c-
drivers/staging/zram/zram_drv.c:663
reset_store() warn: variable dereferenced before check 'bdev' (see line 652)
drivers/staging/zram/zram_drv.c:899
destroy_device() warn: variable dereferenced before check 'zram->disk' (see line 896)
Signed-off-by: Rashika Kheria <rashika.kheria@xxxxxxxxx>
---
This revision fixes the following issues of the previous revision-
Not included null check
drivers/staging/zram/zram_drv.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 2c4ed52..5594d5b 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -648,6 +648,9 @@ static ssize_t reset_store(struct device *dev,
zram = dev_to_zram(dev);
bdev = bdget_disk(zram->disk, 0);
+ if (!bdev)
+ return -EBUSY;
+
/* Do not reset an active device! */
if (bdev->bd_holders)
return -EBUSY;
@@ -660,8 +663,7 @@ static ssize_t reset_store(struct device *dev,
return -EINVAL;
/* Make sure all pending I/O is finished */
- if (bdev)
- fsync_bdev(bdev);
+ fsync_bdev(bdev);
zram_reset_device(zram, true);
return len;
@@ -893,10 +895,9 @@ out:
static void destroy_device(struct zram *zram)
{
- sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
- &zram_disk_attr_group);
-
if (zram->disk) {
+ sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
+ &zram_disk_attr_group);
del_gendisk(zram->disk);
put_disk(zram->disk);
}
--
1.7.9.5
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