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authorTyrel Datwyler <tyreld@linux.vnet.ibm.com>2017-04-17 20:21:40 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-25 14:30:15 +0200
commit33c0c0f8edb9c677608a93c3d4fbb40b05841174 (patch)
tree5cc82d9d3660186ecfa7a142dbbae90ef0885971 /arch/powerpc
parenta86b9ecf1158b62f97587e498f336952dc9c0231 (diff)
powerpc/pseries: Fix of_node_put() underflow during DLPAR remove
commit 68baf692c435339e6295cb470ea5545cbc28160e upstream. Historically struct device_node references were tracked using a kref embedded as a struct field. Commit 75b57ecf9d1d ("of: Make device nodes kobjects so they show up in sysfs") (Mar 2014) refactored device_nodes to be kobjects such that the device tree could by more simply exposed to userspace using sysfs. Commit 0829f6d1f69e ("of: device_node kobject lifecycle fixes") (Mar 2014) followed up these changes to better control the kobject lifecycle and in particular the referecne counting via of_node_get(), of_node_put(), and of_node_init(). A result of this second commit was that it introduced an of_node_put() call when a dynamic node is detached, in of_node_remove(), that removes the initial kobj reference created by of_node_init(). Traditionally as the original dynamic device node user the pseries code had assumed responsibilty for releasing this final reference in its platform specific DLPAR detach code. This patch fixes a refcount underflow introduced by commit 0829f6d1f6, and recently exposed by the upstreaming of the recount API. Messages like the following are no longer seen in the kernel log with this patch following DLPAR remove operations of cpus and pci devices. rpadlpar_io: slot PHB 72 removed refcount_t: underflow; use-after-free. ------------[ cut here ]------------ WARNING: CPU: 5 PID: 3335 at lib/refcount.c:128 refcount_sub_and_test+0xf4/0x110 Fixes: 0829f6d1f69e ("of: device_node kobject lifecycle fixes") Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> [mpe: Make change log commit references more verbose] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/pseries/dlpar.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index f244dcb4f2cf..96536c969c9c 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -280,7 +280,6 @@ int dlpar_detach_node(struct device_node *dn)
if (rc)
return rc;
- of_node_put(dn); /* Must decrement the refcount */
return 0;
}