This is a note to let you know that I've just added the patch titled
regulator: s5m8767: fix get_register() error handling
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
regulator-s5m8767-fix-get_register-error-handling.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e07ff9434167981c993a26d2edbbcb8e13801dbb Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Tue, 16 Feb 2016 15:53:11 +0100
Subject: regulator: s5m8767: fix get_register() error handling
From: Arnd Bergmann <arnd@xxxxxxxx>
commit e07ff9434167981c993a26d2edbbcb8e13801dbb upstream.
The s5m8767_pmic_probe() function calls s5m8767_get_register() to
read data without checking the return code, which produces a compile-time
warning when that data is accessed:
drivers/regulator/s5m8767.c: In function 's5m8767_pmic_probe':
drivers/regulator/s5m8767.c:924:7: error: 'enable_reg' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/regulator/s5m8767.c:944:30: error: 'enable_val' may be used uninitialized in this function [-Werror=maybe-uninitialized]
This changes the s5m8767_get_register() function to return a -EINVAL
not just for an invalid register number but also for an invalid
regulator number, as both would result in returning uninitialized
data. The s5m8767_pmic_probe() function is then changed accordingly
to fail on a read error, as all the other callers of s5m8767_get_register()
already do.
In practice this probably cannot happen, as we don't call
s5m8767_get_register() with invalid arguments, but the gcc
warning seems valid in principle, in terms writing safe
error checking.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Fixes: 9c4c60554acf ("regulator: s5m8767: Convert to use regulator_[enable|disable|is_enabled]_regmap")
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/regulator/s5m8767.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/regulator/s5m8767.c
+++ b/drivers/regulator/s5m8767.c
@@ -202,9 +202,10 @@ static int s5m8767_get_register(struct s
}
}
- if (i < s5m8767->num_regulators)
- *enable_ctrl =
- s5m8767_opmode_reg[reg_id][mode] << S5M8767_ENCTRL_SHIFT;
+ if (i >= s5m8767->num_regulators)
+ return -EINVAL;
+
+ *enable_ctrl = s5m8767_opmode_reg[reg_id][mode] << S5M8767_ENCTRL_SHIFT;
return 0;
}
@@ -937,8 +938,12 @@ static int s5m8767_pmic_probe(struct pla
else
regulators[id].vsel_mask = 0xff;
- s5m8767_get_register(s5m8767, id, &enable_reg,
+ ret = s5m8767_get_register(s5m8767, id, &enable_reg,
&enable_val);
+ if (ret) {
+ dev_err(s5m8767->dev, "error reading registers\n");
+ return ret;
+ }
regulators[id].enable_reg = enable_reg;
regulators[id].enable_mask = S5M8767_ENCTRL_MASK;
regulators[id].enable_val = enable_val;
Patches currently in stable-queue which might be from arnd@xxxxxxxx are
queue-4.5/misc-bmp085-enable-building-as-a-module.patch
queue-4.5/xen-kconfig-don-t-select-input_xen_kbddev_frontend.patch
queue-4.5/regulator-s5m8767-fix-get_register-error-handling.patch
queue-4.5/asm-generic-futex-re-enable-preemption-in-futex_atomic_cmpxchg_inatomic.patch
queue-4.5/paride-make-verbose-parameter-an-int-again.patch
queue-4.5/asoc-s3c24xx-use-const-snd_soc_component_driver-pointer.patch
queue-4.5/scsi_dh-force-modular-build-if-scsi-is-a-module.patch
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