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[177.4.161.87]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-131f00196bcsm1957989c88.0.2026.05.05.20.15.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2026 20:15:55 -0700 (PDT) From: =?utf-8?q?C=C3=A1ssio_Gabriel?= Date: Wed, 06 May 2026 00:15:48 -0300 Subject: [PATCH] ALSA: seq: Fix UMP group 16 filtering Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260506-alsa-seq-ump-group16-filter-v1-1-b75160bf6993@gmail.com> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/yXMMQ6DMAwAwK8gz1hKAsrQr1QdQjBgRCG1CaqE+ HvTdrzlTlASJoVbdYLQwcrbWmDrCuIU1pGQ+2JwxnnTOodh0YBKL8zPhKNsOVmPAy87Cca+jY0 NjfGeoAxJaOD3b78//tbczRT3bwnX9QFmoUlxfwAAAA== X-Change-ID: 20260422-alsa-seq-ump-group16-filter-cd4c31a3066e To: Takashi Iwai , Jaroslav Kysela Cc: linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, =?utf-8?q?C=C3=A1ssio_Gabriel?= X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3181; i=cassiogabrielcontato@gmail.com; h=from:subject:message-id; bh=D4Dm05R02gfMXqFBcn3iEZPk3hEFDGh7B79LWuzYI+Q=; b=owGbwMvMwCV2IdZeKur/u2bG02pJDJm/NmVK1jR8qogQfpL1+mYnb/qqxSWqNl29T1rTDf56P zlivM6ko5SFQYyLQVZMkWV10iLLPV0PrtbHrfCAmcPKBDKEgYtTACYitpaR4czBU02/0uN4/5+/ JRMeFBqfZfVmns/KvsDTW51lm3eWuzD8szu08/bfNzNsbjeuS54clKKdfIvpm0fXU5XF9dF8Tjc e8wAA X-Developer-Key: i=cassiogabrielcontato@gmail.com; a=openpgp; fpr=AB62A239BC8AE0D57F5EA848D05D3F1A5AFFEE83 The sequencer UAPI defines group_filter as an unsigned int bitmap. Bit 0 filters groupless messages and bits 1-16 filter UMP groups 1-16. The internal snd_seq_client storage is only unsigned short, so bit 16 is truncated when userspace sets the filter. The same truncation affects the automatic UMP client filter used to avoid delivery to inactive groups, so events for group 16 cannot be filtered. Store the internal bitmap as unsigned int and keep both userspace-provided and automatically generated values limited to the defined UAPI bits. Fixes: d2b706077792 ("ALSA: seq: Add UMP group filter") Cc: stable@vger.kernel.org Signed-off-by: Cássio Gabriel --- sound/core/seq/seq_clientmgr.c | 2 +- sound/core/seq/seq_clientmgr.h | 5 ++++- sound/core/seq/seq_ump_client.c | 2 +- 3 files changed, 6 insertions(+), 3 deletions(-) diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 75a7a2af9d8c..5719637575a9 100644 --- a/sound/core/seq/seq_clientmgr.c +++ b/sound/core/seq/seq_clientmgr.c @@ -1253,7 +1253,7 @@ static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) client->midi_version = client_info->midi_version; memcpy(client->event_filter, client_info->event_filter, 32); - client->group_filter = client_info->group_filter; + client->group_filter = client_info->group_filter & SND_SEQ_GROUP_FILTER_MASK; /* notify the change */ snd_seq_system_client_ev_client_change(client->number); diff --git a/sound/core/seq/seq_clientmgr.h b/sound/core/seq/seq_clientmgr.h index ece02c58db70..feea8bb7d987 100644 --- a/sound/core/seq/seq_clientmgr.h +++ b/sound/core/seq/seq_clientmgr.h @@ -14,6 +14,9 @@ /* client manager */ +#define SND_SEQ_GROUP_FILTER_MASK GENMASK(SNDRV_UMP_MAX_GROUPS, 0) +#define SND_SEQ_GROUP_FILTER_GROUPS GENMASK(SNDRV_UMP_MAX_GROUPS, 1) + struct snd_seq_user_client { struct file *file; /* file struct of client */ /* ... */ @@ -40,7 +43,7 @@ struct snd_seq_client { int number; /* client number */ unsigned int filter; /* filter flags */ DECLARE_BITMAP(event_filter, 256); - unsigned short group_filter; + unsigned int group_filter; snd_use_lock_t use_lock; int event_lost; /* ports */ diff --git a/sound/core/seq/seq_ump_client.c b/sound/core/seq/seq_ump_client.c index fdc76f23e03f..9079ccfdc866 100644 --- a/sound/core/seq/seq_ump_client.c +++ b/sound/core/seq/seq_ump_client.c @@ -369,7 +369,7 @@ static void setup_client_group_filter(struct seq_ump_client *client) cptr = snd_seq_kernel_client_get(client->seq_client); if (!cptr) return; - filter = ~(1U << 0); /* always allow groupless messages */ + filter = SND_SEQ_GROUP_FILTER_GROUPS; /* always allow groupless messages */ for (p = 0; p < SNDRV_UMP_MAX_GROUPS; p++) { if (client->ump->groups[p].active) filter &= ~(1U << (p + 1)); --- base-commit: 0d672ef050d4e1c3891c9944f72c85769978bbee change-id: 20260422-alsa-seq-ump-group16-filter-cd4c31a3066e Best regards, -- Cássio Gabriel