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[ Upstream commit 72cafe63b35d06b5cfbaf807e90ae657907858da ] The step variable is initialized to zero. It is changed in the loop, but if it's not changed it will remain zero. Add a variable check before the division. The observed behavior was introduced by commit826b5de90c("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size"), and it is difficult to show that any of the interval parameters will satisfy the snd_interval_test() condition with data from the amdtp_rate_table[] table. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes:826b5de90c("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size") Signed-off-by: Andrey Shumilin <shum.sdl@nppct.ru> Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://patch.msgid.link/20241018060018.1189537-1-shum.sdl@nppct.ru Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>