You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
From d3735e837e3102dfee2d2429c8043c9f4c673383 Mon Sep 17 00:00:00 2001
|
|
From: Colin Ian King <colin.king@canonical.com>
|
|
Date: Wed, 2 Sep 2015 07:27:36 -0400
|
|
Subject: [PATCH 173/203] vcsm: increment res_stats MAP_FAIL stats before we
|
|
potentially release the resource
|
|
|
|
resource can be kfree'd when the reference count is zero, so we should
|
|
not bump the res_stats of the resource after the vmcs_sm_release_resource
|
|
call since the resource may have been kfree'd by this call. Instead, bump
|
|
the stats before we call vmcs_sm_release_resource to avoid a potential
|
|
NULL pointer derefernce.
|
|
|
|
Bug found using cppcheck static analysis:
|
|
|
|
[drivers/char/broadcom/vc_sm/vmcs_sm.c:1373]: (error) Dereferencing
|
|
'resource' after it is deallocated / released
|
|
|
|
Signed-off-by: Colin Ian King <colin.king@canonical.com>
|
|
---
|
|
drivers/char/broadcom/vc_sm/vmcs_sm.c | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
--- a/drivers/char/broadcom/vc_sm/vmcs_sm.c
|
|
+++ b/drivers/char/broadcom/vc_sm/vmcs_sm.c
|
|
@@ -1368,8 +1368,8 @@ static int vc_sm_mmap(struct file *file,
|
|
return 0;
|
|
|
|
error:
|
|
- vmcs_sm_release_resource(resource, 0);
|
|
resource->res_stats[MAP_FAIL]++;
|
|
+ vmcs_sm_release_resource(resource, 0);
|
|
return ret;
|
|
}
|
|
|