Messages in this thread Patch in this message | | | From | Aaron Ma <> | Subject | [PATCH 1/2] HID: core: i2c-hid: fix size check and type usage | Date | Wed, 3 Jan 2018 01:30:05 +0800 |
| |
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
| |