From: Arnd Bergmann Date: Sat, 17 Feb 2024 10:42:38 +0000 (+0100) Subject: ALSA: core: fix buffer overflow in test_format_fill_silence() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e8991d1d6498f663889e99ea7fd3cb9c464cebf1;p=linux.git ALSA: core: fix buffer overflow in test_format_fill_silence() KASAN caught a buffer overflow with the hardcoded 2048 byte buffer size, when 2080 bytes are written to it: BUG: KASAN: slab-out-of-bounds in snd_pcm_format_set_silence+0x3bc/0x3e4 Write of size 8 at addr ffff0000c8149800 by task kunit_try_catch/1297 CPU: 0 PID: 1297 Comm: kunit_try_catch Tainted: G N 6.8.0-rc4-next-20240216 #1 Hardware name: linux,dummy-virt (DT) Call trace: kasan_report+0x78/0xc0 __asan_report_store_n_noabort+0x1c/0x28 snd_pcm_format_set_silence+0x3bc/0x3e4 _test_fill_silence+0xdc/0x298 test_format_fill_silence+0x110/0x228 kunit_try_run_case+0x144/0x3bc kunit_generic_run_threadfn_adapter+0x50/0x94 kthread+0x330/0x3e8 ret_from_fork+0x10/0x20 Allocated by task 1297: __kmalloc+0x17c/0x2f0 kunit_kmalloc_array+0x2c/0x78 test_format_fill_silence+0xcc/0x228 kunit_try_run_case+0x144/0x3bc kunit_generic_run_threadfn_adapter+0x50/0x94 kthread+0x330/0x3e8 ret_from_fork+0x10/0x20 Replace the incorrect size with the correct length of 260 64-bit samples. Reported-by: Naresh Kamboju Suggested-by: Ivan Orlov Fixes: 3e39acf56ede ("ALSA: core: Add sound core KUnit test") Signed-off-by: Arnd Bergmann Tested-by: Linux Kernel Functional Testing Acked-by: Ivan Orlov Link: https://lore.kernel.org/r/20240217104311.3749655-1-arnd@kernel.org Signed-off-by: Takashi Iwai --- diff --git a/sound/core/sound_kunit.c b/sound/core/sound_kunit.c index 5d5a7bf88de4f..4212c4a20697d 100644 --- a/sound/core/sound_kunit.c +++ b/sound/core/sound_kunit.c @@ -8,7 +8,8 @@ #include #include -#define SILENCE_BUFFER_SIZE 2048 +#define SILENCE_BUFFER_MAX_FRAMES 260 +#define SILENCE_BUFFER_SIZE (sizeof(u64) * SILENCE_BUFFER_MAX_FRAMES) #define SILENCE(...) { __VA_ARGS__ } #define DEFINE_FORMAT(fmt, pbits, wd, endianness, signd, silence_arr) { \ .format = SNDRV_PCM_FORMAT_##fmt, .physical_bits = pbits, \ @@ -165,7 +166,7 @@ static void _test_fill_silence(struct kunit *test, struct snd_format_test_data * static void test_format_fill_silence(struct kunit *test) { - u32 buf_samples[] = { 10, 20, 32, 64, 129, 260 }; + u32 buf_samples[] = { 10, 20, 32, 64, 129, SILENCE_BUFFER_MAX_FRAMES }; u8 *buffer; u32 i, j;