At the start of driver initialization, we do not know what bias setting the bootloader has configured the system for and we only know for certain the very first time we do a transition.
However, since the initial value of the comparison index is -EINVAL, this negative value results in an array out of bound access on the very first transition.
Since we don't know what the setting is, we just set the bias configuration as there is nothing to compare against. This prevents the array out of bound access.
NOTE: Even though we could use a more relaxed check of "< 0" the only valid values(ignoring cosmic ray induced bitflips) are -EINVAL, 0+.
Fixes: 40b1936efebd ("regulator: Introduce TI Adaptive Body Bias(ABB) on-chip LDO driver") Link: https://lore.kernel.org/linux-mm/CA+G9fYuk4imvhyCN7D7T6PMDH6oNp6HDCRiTUKMQ6Q... Reported-by: Naresh Kamboju naresh.kamboju@linaro.org Reviewed-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Nishanth Menon nm@ti.com ---
Mark,
I will leave it to your descretion if this needs to be tagged for stable or to drop the Fixes tag - Side effect, if this occurs, will be an unstable system very hard to track down - but typically occurring during system boot - Impacts systems: DM3/OMAP3,4,5,DRA7/AM5x.
I would categorize this as "This could be a problem..." problem.. the bug is an out of bound read, and has been around since v3.11 and is not a catastrophic data corruption kind of issue.
Though theoretically, there is a possibility that the compare may pass and result in missing bias configuration(and resulting system will be unstable), I have'nt heard of actual report (but, it will be surprising if any actual instability was actually tracked down to this bug). Any ways, I had to go to git full history to pick the exact commit - I have left it in the patch.
Arnd,
I have left your reviewed-by from the thread, I can fixup any further commit message comments if you may have.
drivers/regulator/ti-abb-regulator.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/regulator/ti-abb-regulator.c b/drivers/regulator/ti-abb-regulator.c index 3e60bff76194..9f0a4d50cead 100644 --- a/drivers/regulator/ti-abb-regulator.c +++ b/drivers/regulator/ti-abb-regulator.c @@ -342,8 +342,17 @@ static int ti_abb_set_voltage_sel(struct regulator_dev *rdev, unsigned sel) return ret; }
- /* If data is exactly the same, then just update index, no change */ info = &abb->info[sel]; + /* + * When Linux kernel is starting up, we are'nt sure of the + * Bias configuration that bootloader has configured. + * So, we get to know the actual setting the first time + * we are asked to transition. + */ + if (abb->current_info_idx == -EINVAL) + goto just_set_abb; + + /* If data is exactly the same, then just update index, no change */ oinfo = &abb->info[abb->current_info_idx]; if (!memcmp(info, oinfo, sizeof(*info))) { dev_dbg(dev, "%s: Same data new idx=%d, old idx=%d\n", __func__, @@ -351,6 +360,7 @@ static int ti_abb_set_voltage_sel(struct regulator_dev *rdev, unsigned sel) goto out; }
+just_set_abb: ret = ti_abb_set_opp(rdev, abb, info);
out: