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platform/x86: sony-laptop: Use scnprintf() for avoiding potential buffer overflow 

Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit.  Fix it by replacing with scnprintf().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Takashi Iwai 2020-03-11 10:07:39 +01:00 committed by Andy Shevchenko
parent 1d6f8c5bac
commit b40e288bfb
1 changed files with 4 additions and 4 deletions
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8
drivers/platform/x86/sony-laptop.c
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@ -827,10 +827,10 @@ static ssize_t sony_nc_handles_show(struct device *dev,
int i;
for (i = 0; i < ARRAY_SIZE(handles->cap); i++) {
len += snprintf(buffer + len, PAGE_SIZE - len, "0x%.4x ",
len += scnprintf(buffer + len, PAGE_SIZE - len, "0x%.4x ",
handles->cap[i]);
}
len += snprintf(buffer + len, PAGE_SIZE - len, "\n");
len += scnprintf(buffer + len, PAGE_SIZE - len, "\n");
return len;
}
@ -2187,10 +2187,10 @@ static ssize_t sony_nc_thermal_profiles_show(struct device *dev,
for (cnt = 0; cnt < THM_PROFILE_MAX; cnt++) {
if (!cnt || (th_handle->profiles & cnt))
idx += snprintf(buffer + idx, PAGE_SIZE - idx, "%s ",
idx += scnprintf(buffer + idx, PAGE_SIZE - idx, "%s ",
snc_thermal_profiles[cnt]);
}
idx += snprintf(buffer + idx, PAGE_SIZE - idx, "\n");
idx += scnprintf(buffer + idx, PAGE_SIZE - idx, "\n");
return idx;
}