Re: [PATCH] [v2] ALSA: core: fix buffer overflow in test_format_fill_silence()

[Takashi Iwai <tiwai@xxxxxxx>]

On Sat, 17 Feb 2024 11:42:38 +0100,
Arnd Bergmann wrote:
> 
> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> 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 <naresh.kamboju@xxxxxxxxxx>
> Suggested-by: Ivan Orlov <ivan.orlov0322@xxxxxxxxx>
> Fixes: 3e39acf56ede ("ALSA: core: Add sound core KUnit test")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> v2: use a named constant as suggested by Ivan Orlov

Thanks, applied now.


Takashi