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regulator: core: replace sprintf with scnprintf

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In order to avoid potential overflows in print_constraints we
better replace sprintf() with scnprintf().

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Stefan Wahren 2015-06-10 06:13:15 +00:00 committed by Mark Brown
parent 96dc589624
commit 5751a99fe9
1 changed files with 24 additions and 19 deletions
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43
drivers/regulator/core.c
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@ -780,58 +780,63 @@ static void print_constraints(struct regulator_dev *rdev)
{ {
struct regulation_constraints *constraints = rdev->constraints; struct regulation_constraints *constraints = rdev->constraints;
char buf[160] = ""; char buf[160] = "";
size_t len = sizeof(buf) - 1;
int count = 0; int count = 0;
int ret; int ret;
if (constraints->min_uV && constraints->max_uV) { if (constraints->min_uV && constraints->max_uV) {
if (constraints->min_uV == constraints->max_uV) if (constraints->min_uV == constraints->max_uV)
count += sprintf(buf + count, "%d mV ", count += scnprintf(buf + count, len - count, "%d mV ",
constraints->min_uV / 1000); constraints->min_uV / 1000);
else else
count += sprintf(buf + count, "%d <--> %d mV ", count += scnprintf(buf + count, len - count,
constraints->min_uV / 1000, "%d <--> %d mV ",
constraints->max_uV / 1000); constraints->min_uV / 1000,
constraints->max_uV / 1000);
} }
if (!constraints->min_uV || if (!constraints->min_uV ||
constraints->min_uV != constraints->max_uV) { constraints->min_uV != constraints->max_uV) {
ret = _regulator_get_voltage(rdev); ret = _regulator_get_voltage(rdev);
if (ret > 0) if (ret > 0)
count += sprintf(buf + count, "at %d mV ", ret / 1000); count += scnprintf(buf + count, len - count,
"at %d mV ", ret / 1000);
} }
if (constraints->uV_offset) if (constraints->uV_offset)
count += sprintf(buf + count, "%dmV offset ", count += scnprintf(buf + count, len - count, "%dmV offset ",
constraints->uV_offset / 1000); constraints->uV_offset / 1000);
if (constraints->min_uA && constraints->max_uA) { if (constraints->min_uA && constraints->max_uA) {
if (constraints->min_uA == constraints->max_uA) if (constraints->min_uA == constraints->max_uA)
count += sprintf(buf + count, "%d mA ", count += scnprintf(buf + count, len - count, "%d mA ",
constraints->min_uA / 1000); constraints->min_uA / 1000);
else else
count += sprintf(buf + count, "%d <--> %d mA ", count += scnprintf(buf + count, len - count,
constraints->min_uA / 1000, "%d <--> %d mA ",
constraints->max_uA / 1000); constraints->min_uA / 1000,
constraints->max_uA / 1000);
} }
if (!constraints->min_uA || if (!constraints->min_uA ||
constraints->min_uA != constraints->max_uA) { constraints->min_uA != constraints->max_uA) {
ret = _regulator_get_current_limit(rdev); ret = _regulator_get_current_limit(rdev);
if (ret > 0) if (ret > 0)
count += sprintf(buf + count, "at %d mA ", ret / 1000); count += scnprintf(buf + count, len - count,
"at %d mA ", ret / 1000);
} }
if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
count += sprintf(buf + count, "fast "); count += scnprintf(buf + count, len - count, "fast ");
if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
count += sprintf(buf + count, "normal "); count += scnprintf(buf + count, len - count, "normal ");
if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
count += sprintf(buf + count, "idle "); count += scnprintf(buf + count, len - count, "idle ");
if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
count += sprintf(buf + count, "standby"); count += scnprintf(buf + count, len - count, "standby");
if (!count) if (!count)
sprintf(buf, "no parameters"); scnprintf(buf, len, "no parameters");
rdev_dbg(rdev, "%s\n", buf); rdev_dbg(rdev, "%s\n", buf);