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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2018-12-19 17:19:20 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-12-19 20:21:06 +0100
commitc18614a1a11276837bdd44403d84d207c9951538 (patch)
treef58caa2fd93696557e8b2ce16952151e72596bf7 /drivers/hwtracing/stm/policy.c
parentfdfaef212694a139ebd5119f9a07f2e8e24be8a6 (diff)
stm class: Fix a module refcount leak in policy creation error path
Commit c7fd62bc69d0 ("stm class: Introduce framing protocol drivers") adds a bug into the error path of policy creation, that would do a module_put() on a wrong module, if one tried to create a policy for an stm device which already has a policy, using a different protocol. IOW, | mkdir /config/stp-policy/dummy_stm.0:p_basic.test | mkdir /config/stp-policy/dummy_stm.0:p_sys-t.test # puts "p_basic" | mkdir /config/stp-policy/dummy_stm.0:p_sys-t.test # "p_basic" -> -1 throws: | general protection fault: 0000 [#1] SMP PTI | CPU: 3 PID: 2887 Comm: mkdir | RIP: 0010:module_put.part.31+0xe/0x90 | Call Trace: | module_put+0x13/0x20 | stm_put_protocol+0x11/0x20 [stm_core] | stp_policy_make+0xf1/0x210 [stm_core] | ? __kmalloc+0x183/0x220 | ? configfs_mkdir+0x10d/0x4c0 | configfs_mkdir+0x169/0x4c0 | vfs_mkdir+0x108/0x1c0 | do_mkdirat+0xe8/0x110 | __x64_sys_mkdir+0x1b/0x20 | do_syscall_64+0x5a/0x140 | entry_SYSCALL_64_after_hwframe+0x44/0xa9 Correct this sad mistake by calling calling 'put' on the correct reference, which happens to match another error path in the same function, so we consolidate the two at the same time. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Fixes: c7fd62bc69d0 ("stm class: Introduce framing protocol drivers") Reported-by: Ammy Yi <ammy.yi@intel.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/stm/policy.c')
-rw-r--r--drivers/hwtracing/stm/policy.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/hwtracing/stm/policy.c b/drivers/hwtracing/stm/policy.c
index 0910ec807187..4b9e44b227d8 100644
--- a/drivers/hwtracing/stm/policy.c
+++ b/drivers/hwtracing/stm/policy.c
@@ -440,10 +440,8 @@ stp_policy_make(struct config_group *group, const char *name)
stm->policy = kzalloc(sizeof(*stm->policy), GFP_KERNEL);
if (!stm->policy) {
- mutex_unlock(&stm->policy_mutex);
- stm_put_protocol(pdrv);
- stm_put_device(stm);
- return ERR_PTR(-ENOMEM);
+ ret = ERR_PTR(-ENOMEM);
+ goto unlock_policy;
}
config_group_init_type_name(&stm->policy->group, name,
@@ -458,7 +456,11 @@ unlock_policy:
mutex_unlock(&stm->policy_mutex);
if (IS_ERR(ret)) {
- stm_put_protocol(stm->pdrv);
+ /*
+ * pdrv and stm->pdrv at this point can be quite different,
+ * and only one of them needs to be 'put'
+ */
+ stm_put_protocol(pdrv);
stm_put_device(stm);
}