Author: kib
Date: Sun Feb 14 17:21:19 2016
New Revision: 295613
URL: https://svnweb.freebsd.org/changeset/base/295613
Log:
MFC r294595:
When devfs dirent is freed, a vnode might still keep a pointer to it,
apparently. Interlock and clear the pointer to avoid free memory
dereference.
Approved by: re (marius)
Modified:
stable/10/sys/fs/devfs/devfs_devs.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/fs/devfs/devfs_devs.c
==============================================================================
--- stable/10/sys/fs/devfs/devfs_devs.c Sun Feb 14 16:38:32 2016
(r295612)
+++ stable/10/sys/fs/devfs/devfs_devs.c Sun Feb 14 17:21:19 2016
(r295613)
@@ -304,6 +304,13 @@ devfs_vmkdir(struct devfs_mount *dmp, ch
void
devfs_dirent_free(struct devfs_dirent *de)
{
+ struct vnode *vp;
+
+ vp = de->de_vnode;
+ mtx_lock(&devfs_de_interlock);
+ if (vp != NULL && vp->v_data == de)
+ vp->v_data = NULL;
+ mtx_unlock(&devfs_de_interlock);
free(de, M_DEVFS3);
}
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