On Mon, 10 Feb 2020, Peter Enderborg wrote:
In the patch "HID: Fix slab-out-of-bounds read in hid_field_extract" there added a check for buffer overruns. This made Elgato StreamDeck to fail. This patch extend the buffer to 8192 to solve this. It also adds a print of the requested length if it fails on this test.
Signed-off-by: Peter Enderborg peter.enderborg@sony.com
drivers/hid/hid-core.c | 2 +- include/linux/hid.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 851fe54ea59e..28841219b3d2 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -290,7 +290,7 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign /* Total size check: Allow for possible report index byte */ if (report->size > (HID_MAX_BUFFER_SIZE - 1) << 3) {
hid_err(parser->device, "report is too long\n");
hid_err(parser->device, "report is too long (%d)\n", report->size);diff --git a/include/linux/hid.h b/include/linux/hid.h index cd41f209043f..875f71132b14 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -492,7 +492,7 @@ struct hid_report_enum { }; #define HID_MIN_BUFFER_SIZE 64 /* make sure there is at least a packet size of space */ -#define HID_MAX_BUFFER_SIZE 4096 /* 4kb */ +#define HID_MAX_BUFFER_SIZE 8192 /* 8kb */ #define HID_CONTROL_FIFO_SIZE 256 /* to init devices with >100 reports */ #define HID_OUTPUT_FIFO_SIZE 64
The second part of this patch is identical to the "HID: core: increase HID report buffer size to 8KiB" patch submitted by Johan Korsnes a few weeks ago. You might want to submit just the first part of your patch, or not submit anything at all.
Alan Stern