CVE-2023-54245

Summary

In the Linux kernel, the following vulnerability has been resolved:

ASoC: codecs: tx-macro: Fix for KASAN: slab-out-of-bounds

When we run syzkaller we get below Out of Bound. "KASAN: slab-out-of-bounds Read in regcache_flat_read"

Below is the backtrace of the issue:

dump_backtrace+0x0/0x4c8
show_stack+0x34/0x44
dump_stack_lvl+0xd8/0x118
print_address_description+0x30/0x2d8
kasan_report+0x158/0x198
__asan_report_load4_noabort+0x44/0x50
regcache_flat_read+0x10c/0x110
regcache_read+0xf4/0x180
_regmap_read+0xc4/0x278
_regmap_update_bits+0x130/0x290
regmap_update_bits_base+0xc0/0x15c
snd_soc_component_update_bits+0xa8/0x22c
snd_soc_component_write_field+0x68/0xd4
tx_macro_digital_mute+0xec/0x140

Actually There is no need to have decimator with 32 bits.
By limiting the variable with short type u8 issue is resolved.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/da35a4e6eee5d73886312e85322a6e97df901987
• https://git.kernel.org/stable/c/57f9a9a232bde7abfe49c3072b29a255da9ba891
• https://git.kernel.org/stable/c/b0cd740a31412340fead50e69e4fe9bc3781c754
• https://git.kernel.org/stable/c/e5e7e398f6bb7918dab0612eb6991f7bae95520d

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