Currently the read event packet size in snd_seq_read() is defined by client->midi_version value that is guaranteed to be zero if UMP isn't enabled. But the static analyzer doesn't know of the fact, and it still suspects as if it were leading to a potential overflow.
Add the more explicit check of CONFIG_SND_SEQ_UMP to determine the aligned_size value for avoiding the confusion.
Fixes: 46397622a3fa ("ALSA: seq: Add UMP support") Reported-by: kernel test robot lkp@intel.com Reported-by: Dan Carpenter error27@gmail.com Closes: https://lore.kernel.org/r/202305261415.NY0vapZK-lkp@intel.com/ Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/core/seq/seq_clientmgr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 948ae45e0cc3..e3f9ea67d019 100644 --- a/sound/core/seq/seq_clientmgr.c +++ b/sound/core/seq/seq_clientmgr.c @@ -451,7 +451,7 @@ static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, err = 0; snd_seq_fifo_lock(fifo);
- if (client->midi_version > 0) + if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0) aligned_size = sizeof(struct snd_seq_ump_event); else aligned_size = sizeof(struct snd_seq_event);