muser: fix libmuser_mmap_dev()

--Fix addr passed to vm_insert_page()
The addr passed to vm_insert_page() should start from vm_start and
incremented by PAGE_SIZE
hence 'i' must be used in the calculation and not cur_pgidx(which is the
index to fond the page)

--Add new pages index to new_pgs
new_pgs[] is an array of newly allocated pages, it is used for the
cleanup in case of failure. It must be populated by the page_index of
new allocated pages.

Signed-off-by: Swapnil Ingle <swapnil.ingle@nutanix.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/kmod/muser.c b/kmod/muser.c
index a4ec3fb..95c1a05 100644
--- a/kmod/muser.c
+++ b/kmod/muser.c
@@ -519,9 +519,10 @@ static int libmuser_mmap_dev(struct file *fp, struct vm_area_struct *vma)
 				ret = -ENOMEM;
 				goto free_pg;
 			}
+			new_pgs[i] = cur_pgidx;
 		}
 
-		addr = vma->vm_start + (cur_pgidx << PAGE_SHIFT);
+		addr = vma->vm_start + (i << PAGE_SHIFT);
 		ret = vm_insert_page(vma, addr, pg);
 		if (unlikely(ret))
 			goto free_pg;