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| author | kib <kib@FreeBSD.org> | 2016-02-14 17:21:19 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2016-02-14 17:21:19 +0000 |
| commit | 8b9d16815392c18a9a8b20089db0506d3b80e711 (patch) | |
| tree | 9907ca1d520bba25645f781a277dd6ec3aa0e246 /sys | |
| parent | a3f0577ed04b6c469cd8c282522893364bebcf3f (diff) | |
| download | FreeBSD-src-8b9d16815392c18a9a8b20089db0506d3b80e711.zip FreeBSD-src-8b9d16815392c18a9a8b20089db0506d3b80e711.tar.gz | |
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)
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/fs/devfs/devfs_devs.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/fs/devfs/devfs_devs.c b/sys/fs/devfs/devfs_devs.c index 5070985..4723a63 100644 --- a/sys/fs/devfs/devfs_devs.c +++ b/sys/fs/devfs/devfs_devs.c @@ -304,6 +304,13 @@ devfs_vmkdir(struct devfs_mount *dmp, char *name, int namelen, struct devfs_dire 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); } |
