Description

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.

References 4

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

Remediation