When we run syzkaller we get below Out of Bounds error.
"KASAN: slab-out-of-bounds Read in regcache_flat_read"
Below is the backtrace of the issue:
BUG: KASAN: slab-out-of-bounds in regcache_flat_read+0x10c/0x110
Read of size 4 at addr ffffff8088fbf714 by task syz-executor.4/14144
CPU: 6 PID: 14144 Comm: syz-executor.4 Tainted: G W
Hardware name: Qualcomm Technologies, Inc. sc7280 CRD platform (rev5+) (DT)
Call trace:
dump_backtrace+0x0/0x4ec
show_stack+0x34/0x50
dump_stack_lvl+0xdc/0x11c
print_address_description+0x30/0x2d8
kasan_report+0x178/0x1e4
__asan_report_load4_noabort+0x44/0x50
regcache_flat_read+0x10c/0x110
regcache_read+0xf8/0x5a0
_regmap_read+0x45c/0x86c
_regmap_update_bits+0x128/0x290
regmap_update_bits_base+0xc0/0x15c
snd_soc_component_update_bits+0xa8/0x22c
snd_soc_component_write_field+0x68/0xd4
tx_macro_put_dec_enum+0x1d0/0x268
snd_ctl_elem_write+0x288/0x474
By Error checking and checking valid values issue gets rectifies.
Signed-off-by: Ravulapati Vishnu Vardhan Rao <[email protected]>
---
sound/soc/codecs/lpass-tx-macro.c | 5 +++++
1 file changed, 5 insertions(+)
Changes Since v1:
- Check value with enum item value getting from control.
- Removing of previously added code which is unwanted as already we get
out with -EINVAL if value is out of bound.
diff --git a/sound/soc/codecs/lpass-tx-macro.c b/sound/soc/codecs/lpass-tx-macro.c
index da6fcf7f0991..de978c3d70b7 100644
--- a/sound/soc/codecs/lpass-tx-macro.c
+++ b/sound/soc/codecs/lpass-tx-macro.c
@@ -746,6 +746,8 @@ static int tx_macro_put_dec_enum(struct snd_kcontrol *kcontrol,
struct tx_macro *tx = snd_soc_component_get_drvdata(component);
val = ucontrol->value.enumerated.item[0];
+ if (val >= e->items)
+ return -EINVAL;
switch (e->reg) {
case CDC_TX_INP_MUX_ADC_MUX0_CFG0:
@@ -772,6 +774,9 @@ static int tx_macro_put_dec_enum(struct snd_kcontrol *kcontrol,
case CDC_TX_INP_MUX_ADC_MUX7_CFG0:
mic_sel_reg = CDC_TX7_TX_PATH_CFG0;
break;
+ default:
+ dev_err(component->dev, "Error in configuration!!\n");
+ return -EINVAL;
}
if (val != 0) {
--
2.17.1
On Thu, 11 May 2023 16:55:32 +0530, Ravulapati Vishnu Vardhan Rao wrote:
> When we run syzkaller we get below Out of Bounds error.
>
> "KASAN: slab-out-of-bounds Read in regcache_flat_read"
>
> Below is the backtrace of the issue:
>
> BUG: KASAN: slab-out-of-bounds in regcache_flat_read+0x10c/0x110
> Read of size 4 at addr ffffff8088fbf714 by task syz-executor.4/14144
> CPU: 6 PID: 14144 Comm: syz-executor.4 Tainted: G W
> Hardware name: Qualcomm Technologies, Inc. sc7280 CRD platform (rev5+) (DT)
> Call trace:
> dump_backtrace+0x0/0x4ec
> show_stack+0x34/0x50
> dump_stack_lvl+0xdc/0x11c
> print_address_description+0x30/0x2d8
> kasan_report+0x178/0x1e4
> __asan_report_load4_noabort+0x44/0x50
> regcache_flat_read+0x10c/0x110
> regcache_read+0xf8/0x5a0
> _regmap_read+0x45c/0x86c
> _regmap_update_bits+0x128/0x290
> regmap_update_bits_base+0xc0/0x15c
> snd_soc_component_update_bits+0xa8/0x22c
> snd_soc_component_write_field+0x68/0xd4
> tx_macro_put_dec_enum+0x1d0/0x268
> snd_ctl_elem_write+0x288/0x474
>
> [...]
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ASoC:codecs: lpass: Fix for KASAN use_after_free out of bounds
commit: 75e5fab7db0cecb6e16b22c34608f0b40a4c7cd1
All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying
to this mail.
Thanks,
Mark