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server: Avoid potential size overflow for empty object attributes. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2018-09-18 20:17:54 +02:00
parent 0e70a10954
commit aec7befb51
1 changed files with 10 additions and 3 deletions
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13
server/request.c
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@ -166,12 +166,13 @@ void *set_reply_data_size( data_size_t size )
return current->reply_data;
}
static const struct object_attributes empty_attributes;
/* return object attributes from the current request */
const struct object_attributes *get_req_object_attributes( const struct security_descriptor **sd,
struct unicode_str *name,
struct object **root )
{
static const struct object_attributes empty_attributes;
const struct object_attributes *attr = get_req_data();
data_size_t size = get_req_data_size();
@ -213,8 +214,14 @@ const struct object_attributes *get_req_object_attributes( const struct security
/* return a pointer to the request data following an object attributes structure */
const void *get_req_data_after_objattr( const struct object_attributes *attr, data_size_t *len )
{
const void *ptr = (const WCHAR *)((const struct object_attributes *)get_req_data() + 1) +
attr->sd_len / sizeof(WCHAR) + attr->name_len / sizeof(WCHAR);
const void *ptr;
if (attr == &empty_attributes)
{
*len = 0;
return NULL;
}
ptr = (const WCHAR *)(attr + 1) + attr->sd_len / sizeof(WCHAR) + attr->name_len / sizeof(WCHAR);
*len = get_req_data_size() - ((const char *)ptr - (const char *)get_req_data());
return ptr;
}