Re: [PATCH] ALSA: seq: oss: Reject reads that cannot fit the next event

[Takashi Iwai <tiwai@suse.de>]

On Tue, 02 Jun 2026 13:18:39 +0200,
Cássio Gabriel wrote:
> 
> snd_seq_oss_read() checks whether the next queued OSS sequencer event
> fits in the remaining userspace buffer before removing it from the read
> queue.
> 
> The check is inverted. It currently stops when the event is smaller than
> the remaining buffer, so a normal 4-byte event is not copied for an
> 8-byte read buffer. Conversely, an 8-byte event can be copied for a
> smaller read count.
> 
> Break only when the remaining userspace buffer is smaller than the next
> event, and report -EINVAL if no complete event has been copied. This
> prevents an undersized read from looking like end-of-file while leaving
> the event queued for a later read with a large enough buffer.
> 
> Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>

Applied to for-next branch now.  Thanks.


Takashi