HID: bpf: fix __hid_bpf_hw_check_params report length

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Turns out that USB, I2C and other transport drivers (except uhid which
just passes the data) still need to have the report ID in the first
byte.

Because they expect the first byte to be the report ID or 0, when the
report ID is 0, they strip that first byte before forwarding to the
device. This means that the transport layer forwards a buffer of size
N-1 to the device, which gets rejected.

Fixes: 5599f80196 ("HID: bpf: export hid_hw_output_report as a BPF kfunc")
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

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Benjamin Tissoires 2026-09-04 14:53:00 +02:00

parent 9d1e523b92

commit c4afa4862b

1 changed files with 8 additions and 4 deletions

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drivers/hid/bpf/hid_bpf_dispatch.c

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