FAILED: patch "[PATCH] ALSA: compress: reject buffer geometry change on gapless next_track" failed to apply to 6.6-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 82da1acad6fd60b6072dd5f3383e6a55efdd2ac7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107053651-failed-6.6-82da1acad6fd@kernel.org' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 82da1acad6fd60b6072dd5f3383e6a55efdd2ac7 Mon Sep 17 00:00:00 2001
From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Date: Mon, 19 Oct 2026 17:45:31 +0300
Subject: [PATCH] ALSA: compress: reject buffer geometry change on gapless
 next_track

snd_compr_set_params() is invoked from the gapless next_track
re-entry path, which calls snd_compr_allocate_buffer() again and lets
buffer_size change while total_bytes_available and
total_bytes_transferred still hold values computed for the previous
buffer. snd_compr_calc_avail() then derives an avail/count value from
those stale counters against the new buffer_size, and
snd_compr_write_data() copy_from_user()s that many bytes into the
new, potentially smaller buffer, overflowing it with user-controlled
length and content.

The buffer is set up once, with the initial SET_PARAMS, and neither the
core nor the DSP expects it to change for a gapless track transition.
Do not call snd_compr_allocate_buffer() on the next_track path and
reject a request that changes the buffer geometry, so that the codec
parameters that the driver receives match the buffer in use.

Fixes: 9727b490e543 ("ALSA: compress: add support for gapless playback")
Cc: stable@vger.kernel.org
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://patch.msgid.link/20261019144533.30665-3-peter.ujfalusi@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/compress_offload.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 50301f72579ee..d6863336f21cb 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -697,9 +697,19 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
 		if (retval)
 			return retval;
 
-		retval = snd_compr_allocate_buffer(stream, params);
-		if (retval)
-			return -ENOMEM;
+		if (stream->next_track) {
+			/*
+			 * total_bytes_available/transferred still refer to the
+			 * current buffer; its geometry must not change.
+			 */
+			if (params->buffer.fragment_size != stream->runtime->fragment_size ||
+			    params->buffer.fragments != stream->runtime->fragments)
+				return -EINVAL;
+		} else {
+			retval = snd_compr_allocate_buffer(stream, params);
+			if (retval)
+				return retval;
+		}
 
 		retval = stream->ops->set_params(stream, params);
 		if (retval) {
-- 
2.53.0