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HID: core: Fix size as type u32 

When size is negative, calling memset will make segment fault.
Declare the size as type u32 to keep memset safe.

size in struct hid_report is unsigned, fix return type of
hid_report_len to u32.

Cc: stable@vger.kernel.org
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Aaron Ma 2018-01-08 10:41:41 +08:00 committed by Jiri Kosina
parent ac75a04104
commit 6de0b13cc0
2 changed files with 8 additions and 8 deletions
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10
drivers/hid/hid-core.c
View File

@ -1365,7 +1365,7 @@ u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags)
* of implement() working on 8 byte chunks
*/
int len = hid_report_len(report) + 7;
u32 len = hid_report_len(report) + 7;
return kmalloc(len, flags);
}
@ -1430,7 +1430,7 @@ void __hid_request(struct hid_device *hid, struct hid_report *report,
{
char *buf;
int ret;
int len;
u32 len;
buf = hid_alloc_report_buf(report, GFP_KERNEL);
if (!buf)
@ -1456,14 +1456,14 @@ out:
}
EXPORT_SYMBOL_GPL(__hid_request);
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
int interrupt)
{
struct hid_report_enum *report_enum = hid->report_enum + type;
struct hid_report *report;
struct hid_driver *hdrv;
unsigned int a;
int rsize, csize = size;
u32 rsize, csize = size;
u8 *cdata = data;
int ret = 0;
@ -1521,7 +1521,7 @@ EXPORT_SYMBOL_GPL(hid_report_raw_event);
*
* This is data entry for lower layers.
*/
int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int interrupt)
int hid_input_report(struct hid_device *hid, int type, u8 *data, u32 size, int interrupt)
{
struct hid_report_enum *report_enum;
struct hid_driver *hdrv;

6
include/linux/hid.h
View File

@ -851,7 +851,7 @@ extern int hidinput_connect(struct hid_device *hid, unsigned int force);
extern void hidinput_disconnect(struct hid_device *);
int hid_set_field(struct hid_field *, unsigned, __s32);
int hid_input_report(struct hid_device *, int type, u8 *, int, int);
int hid_input_report(struct hid_device *, int type, u8 *, u32, int);
int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int code, struct hid_field **field);
struct hid_field *hidinput_get_led_field(struct hid_device *hid);
unsigned int hidinput_count_leds(struct hid_device *hid);
@ -1102,13 +1102,13 @@ static inline void hid_hw_wait(struct hid_device *hdev)
*
* @report: the report we want to know the length
*/
static inline int hid_report_len(struct hid_report *report)
static inline u32 hid_report_len(struct hid_report *report)
{
/* equivalent to DIV_ROUND_UP(report->size, 8) + !!(report->id > 0) */
return ((report->size - 1) >> 3) + 1 + (report->id > 0);
}
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
int interrupt);
/* HID quirks API */