[PATCH 3.16 011/366] HID: core: Fix size as type u32

Ben Hutchings
2018-10-14T23:11:39Z

From: Aaron Ma <aaron.ma@canonical.com>

commit 6de0b13cc0b4ba10e98a9263d7a83b940720b77a upstream.

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.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/hid/hid-core.c | 10 +++++-----
include/linux/hid.h | 6 +++---
2 files changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1284,7 +1284,7 @@ void hid_output_report(struct hid_report
}
EXPORT_SYMBOL_GPL(hid_output_report);

-static int hid_report_len(struct hid_report *report)
+static 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);
@@ -1300,7 +1300,7 @@ u8 *hid_alloc_report_buf(struct hid_repo
* 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);
}
@@ -1365,7 +1365,7 @@ void __hid_request(struct hid_device *hi
{
char *buf;
int ret;
- int len;
+ u32 len;

buf = hid_alloc_report_buf(report, GFP_KERNEL);
if (!buf)
@@ -1391,14 +1391,14 @@ 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;

@@ -1456,7 +1456,7 @@ 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;
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -757,7 +757,7 @@ extern int hidinput_connect(struct hid_d
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);
@@ -1055,7 +1055,7 @@ static inline void hid_hw_wait(struct hi
hdev->ll_driver->wait(hdev);
}

-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 */