| Message ID | 1457637535-21633-9-git-send-email-jack@suse.cz (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
diff --git a/fs/dax.c b/fs/dax.c index 4aa440f9305b..bf39f16e5390 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -680,7 +680,9 @@ int __dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf, if (error) goto unlock_page; vmf->page = page; - return VM_FAULT_LOCKED; + if (page) + return VM_FAULT_LOCKED; + return 0; } /* Check we didn't race with a read fault installing a new page */
In case of cow fault when there is no page mapped at cow location, we return VM_FAULT_LOCKED despite we don't return any page from the fault. The code in do_cow_fault() carefully handled the case when no page was actually returned so no harm was done but still this is a bug waiting to happen. Signed-off-by: Jan Kara <jack@suse.cz> --- fs/dax.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)