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md-cluster: Fix potential error pointer dereference in resize_bitmaps() 

The error handling calls md_bitmap_free(bitmap) which checks for NULL
but will Oops if we pass an error pointer.  Let's set "bitmap" to NULL
on this error path.

Fixes: afd7562860 ("md-cluster/raid10: resize all the bitmaps before start reshape")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Dan Carpenter 2020-08-04 13:16:45 +03:00 committed by Song Liu
parent e8efa9b88e
commit e8abe1de43
1 changed files with 1 additions and 0 deletions
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drivers/md/md-cluster.c
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@ -1139,6 +1139,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
bitmap = get_bitmap_from_slot(mddev, i);
if (IS_ERR(bitmap)) {
pr_err("can't get bitmap from slot %d\n", i);
bitmap = NULL;
goto out;
}
counts = &bitmap->counts;