On Wed, Oct 30, 2013 at 04:40:54AM +0530, Rashika Kheria wrote: > This patch fixes the bug in reset_store caused by accessing NULL pointer. > > The bdev gets its value from bdget_disk() which could fail when memory > pressure is severe and hence can return NULL because allocation of > inode in bdget could fail. > > Hence, this patch introduces a check for bdev to prevent reference to a > NULL pointer in the later part of the code. It also removes unnecessary > check of bdev for fsync_bdev(). > > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Rashika Kheria <rashika.kheria@xxxxxxxxx> > --- > > This patch fixes the following issues of the previous revision- > Better Description > > drivers/staging/zram/zram_drv.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c > index 2c4ed52..d640a8f 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; > + Oops, Sorry. I don't think EBUSY is right. How about ENOMEM? -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html