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HID: ft260: fix a NULL pointer dereference in ft260_i2c_write

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The zero-length passed into the ft260_i2c_write() triggered the
NULL pointer dereference in the debug message on data[0] access.
Since the controller does not support a write of zero length,
let's not allow it.

Before:

$ sudo i2ctransfer -y 13 w0@0x51
Killed

After:

$ sudo i2ctransfer -y 13 w0@0x51
Error: Sending messages failed: Invalid argument

Reported-by: Enrik Berkhan <Enrik.Berkhan@inka.de>
Signed-off-by: Michael Zaidman <michael.zaidman@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Michael Zaidman 2022-11-05 23:11:49 +02:00 committed by Jiri Kosina
parent 4b3da6853a
commit c2500bdffe
1 changed files with 3 additions and 0 deletions
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3
drivers/hid/hid-ft260.c
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@ -409,6 +409,9 @@ static int ft260_i2c_write(struct ft260_device *dev, u8 addr, u8 *data,
struct ft260_i2c_write_request_report *rep =
(struct ft260_i2c_write_request_report *)dev->write_buf;
if (len < 1)
return -EINVAL;
rep->flag = FT260_FLAG_START;
do {