4.9-stable review patch. If anyone has any objections, please let me know.
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From: Aaron Ma aaron.ma@canonical.com
commit ac75a041048b8c1f7418e27621ca5efda8571043 upstream.
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.
Cc: stable@vger.kernel.org Signed-off-by: Aaron Ma aaron.ma@canonical.com Signed-off-by: Jiri Kosina jkosina@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/hid/i2c-hid/i2c-hid.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
--- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -142,10 +142,10 @@ 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 */ @@ -451,7 +451,8 @@ out_unlock:
static void i2c_hid_get_input(struct i2c_hid *ihid) { - int ret, ret_size; + int ret; + u32 ret_size; int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
if (size > ihid->bufsize) @@ -476,7 +477,7 @@ static void i2c_hid_get_input(struct i2c return; }
- if (ret_size > size) { + if ((ret_size > size) || (ret_size <= 2)) { dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n", __func__, size, ret_size); return;