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Verify the object/vnode association after vget() in vm_pageout_clean().

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It's theoretically possible for the vnode and object to be disassociated
while locks are dropped around the vget() call, in which case we
shouldn't proceed with laundering.

Noted and reviewed by:	kib
MFC after:	1 week
This commit is contained in:
markj 2017-11-29 19:47:09 +00:00
parent 23eaeecabf
commit 40d9c0da1e
1 changed files with 10 additions and 0 deletions
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10
sys/vm/vm_pageout.c
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@ -647,7 +647,17 @@ vm_pageout_clean(vm_page_t m, int *numpagedout)
goto unlock_mp; goto unlock_mp;
} }
VM_OBJECT_WLOCK(object); VM_OBJECT_WLOCK(object);
/*
* Ensure that the object and vnode were not disassociated
* while locks were dropped.
*/
if (vp->v_object != object) {
error = ENOENT;
goto unlock_all;
}
vm_page_lock(m); vm_page_lock(m);
/* /*
* While the object and page were unlocked, the page * While the object and page were unlocked, the page
* may have been: * may have been: