From: Christophe JAILLET christophe.jaillet@wanadoo.fr
[ Upstream commit 1f704fd0d14043e76e80f6b8b2251b9b2cedcca6 ]
A semaphore is acquired before this check, so we must release it before leaving.
Link: http://lkml.kernel.org/r/20171211211009.4971-1-christophe.jaillet@wanadoo.fr Fixes: b7f0554a56f2 ("mm: fail get_vaddr_frames() for filesystem-dax mappings") Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Acked-by: Michal Hocko mhocko@suse.com Cc: Dan Williams dan.j.williams@intel.com Cc: Christian Borntraeger borntraeger@de.ibm.com Cc: David Sterba dsterba@suse.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- mm/frame_vector.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/frame_vector.c b/mm/frame_vector.c index 297c7238f7d4..c64dca6e27c2 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -62,8 +62,10 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, * get_user_pages_longterm() and disallow it for filesystem-dax * mappings. */ - if (vma_is_fsdax(vma)) - return -EOPNOTSUPP; + if (vma_is_fsdax(vma)) { + ret = -EOPNOTSUPP; + goto out; + }
if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { vec->got_ref = true;