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dlm: Fix kernel memory disclosure

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Clear the 'unused' field and the uninitialized padding in 'lksb' to
avoid leaking memory to userland in copy_result_to_user().

Signed-off-by: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Vlad Tsyrklevich 2017-02-22 15:31:45 -06:00 • committed by David Teigland
commit 8286d6b14c
1 changed files with 2 additions and 0 deletions
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2
fs/dlm/user.c
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@ -123,6 +123,8 @@ static void compat_input(struct dlm_write_request *kb,
static void compat_output(struct dlm_lock_result *res,
struct dlm_lock_result32 *res32)
{
memset(res32, 0, sizeof(*res32));
res32->version[0] = res->version[0];
res32->version[1] = res->version[1];
res32->version[2] = res->version[2];