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SubjectRe: [PATCH] selinux: fix memory leak in sel_make_bools
On 08/14/2009 02:55 AM, Paul Moore wrote:
> On Thursday 13 August 2009 04:26:16 am Xiaotian Feng wrote:
>> In sel_make_bools, kernel allocates memory for bool_pending_names[i]
>> with security_get_bools. So if we just free bool_pending_names, those
>> memories for bool_pending_names[i] will be leaked.
>>
>> This patch resolves dozens of following kmemleak report after resuming
>> from suspend:
>> unreferenced object 0xffff88022e4c7380 (size 32):
>> comm "init", pid 1, jiffies 4294677173
>> backtrace:
>> [<ffffffff810f76b5>] create_object+0x1a2/0x2a9
>> [<ffffffff810f78bb>] kmemleak_alloc+0x26/0x4b
>> [<ffffffff810ef3eb>] __kmalloc+0x18f/0x1b8
>> [<ffffffff811cd511>] security_get_bools+0xd7/0x16f
>> [<ffffffff811c48c0>] sel_write_load+0x12e/0x62b
>> [<ffffffff810f9a39>] vfs_write+0xae/0x10b
>> [<ffffffff810f9b56>] sys_write+0x4a/0x6e
>> [<ffffffff81011b82>] system_call_fastpath+0x16/0x1b
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> Signed-off-by: Xiaotian Feng<dfeng@redhat.com>
>> ---
>> security/selinux/selinuxfs.c | 6 +++++-
>> 1 files changed, 5 insertions(+), 1 deletions(-)
>>
>> diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
>> index b4fc506..ab93472 100644
>> --- a/security/selinux/selinuxfs.c
>> +++ b/security/selinux/selinuxfs.c
>> @@ -979,7 +979,11 @@ static int sel_make_bools(void)
>> u32 sid;
>>
>> /* remove any existing files */
>> - kfree(bool_pending_names);
>> + if (bool_pending_names) {
>> + for (i = 0; i< bool_num; i++)
>> + kfree(bool_pending_names[i]);
>> + kfree(bool_pending_names);
>> + }
>> kfree(bool_pending_values);
>> bool_pending_names = NULL;
>> bool_pending_values = NULL;
>
> Since the code seems to rely on 'bool_num' in other places to ensure we don't
> walk off the end of the array it is probably safe to omit the 'if
> (bool_pending_names) ...' conditional and just rely on the for loop to do the
> right thing.
Thanks for point out, I'll resend V2 patch :-)



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