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Subject[PATCH 1/2] HID: core: i2c-hid: fix size check and type usage
Date
When convert char array with signed int, if the inbuf[x] is negative then
upper bits will be set to 1. Fix this by using u8 instead of char.

ret_size has to be at least 3, hid_input_report use it after minus 2 bytes.

size should be more than 0 to keep memset safe.

Cc: stable@vger.kernel.org
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
---
drivers/hid/hid-core.c | 4 ++--
drivers/hid/i2c-hid/i2c-hid.c | 10 +++++-----
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 0c3f608131cf..992547771d96 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1506,7 +1506,7 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
if (rsize > HID_MAX_BUFFER_SIZE)
rsize = HID_MAX_BUFFER_SIZE;

- if (csize < rsize) {
+ if ((csize < rsize) && (csize > 0)) {
dbg_hid("report %d is too short, (%d < %d)\n", report->id,
csize, rsize);
memset(cdata + csize, 0, rsize - csize);
@@ -1566,7 +1566,7 @@ int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int i
report_enum = hid->report_enum + type;
hdrv = hid->driver;

- if (!size) {
+ if (size <= 0) {
dbg_hid("empty report\n");
ret = -1;
goto unlock;
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index e054ee43c1e2..09404ffdb08b 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -144,10 +144,10 @@ struct i2c_hid {
* register of the HID
* descriptor. */
unsigned int bufsize; /* i2c buffer size */
- char *inbuf; /* Input buffer */
- char *rawbuf; /* Raw Input buffer */
- char *cmdbuf; /* Command buffer */
- char *argsbuf; /* Command arguments buffer */
+ u8 *inbuf; /* Input buffer */
+ u8 *rawbuf; /* Raw Input buffer */
+ u8 *cmdbuf; /* Command buffer */
+ u8 *argsbuf; /* Command arguments buffer */

unsigned long flags; /* device flags */
unsigned long quirks; /* Various quirks */
@@ -473,7 +473,7 @@ static void i2c_hid_get_input(struct i2c_hid *ihid)

ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;

- if (!ret_size) {
+ if (ret_size <= 2) {
/* host or device initiated RESET completed */
if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
wake_up(&ihid->wait);
--
2.14.3
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