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Commit 9b83c771 authored by Dan Carpenter's avatar Dan Carpenter Committed by Konrad Rzeszutek Wilk
Browse files

xen/blkback: potential null dereference in error handling 



blkbk->pending_pages can be NULL here so I added a check for it.

Signed-off-by: default avatarDan Carpenter <error27@gmail.com>
[v1: Redid the loop a bit]
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 6464920a

drivers/block/xen-blkback/blkback.c

+6 −4
Original line number Diff line number Diff line
@@ -809,11 +809,13 @@ static int __init xen_blkif_init(void) 
 failed_init:

	kfree(blkbk->pending_reqs);

	kfree(blkbk->pending_grant_handles);

	if (blkbk->pending_pages) {

		for (i = 0; i < mmap_pages; i++) {

			if (blkbk->pending_pages[i])

				__free_page(blkbk->pending_pages[i]);

		}

		kfree(blkbk->pending_pages);

	}

	kfree(blkbk);

	blkbk = NULL;

	return rc;