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Commit dcbfb815 authored by Peter Feuerer's avatar Peter Feuerer Committed by Len Brown
Browse files

drivers/platform/x86/acerhdf.c: check BIOS information whether it begins with string of table 



BIOS information is now checked whether it begins with the strings stored
in the BIOS table.  Previous method did a strcmp, what lead to problems if
BIOS information has appended whitespaces.

Signed-off-by: default avatarPeter Feuerer <peter@piie.net>
Cc: Borislav Petkov <petkovbb@gmail.com>
Cc: Andreas Mohr <andi@lisas.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 94219d79

drivers/platform/x86/acerhdf.c

+28 −18
Original line number Diff line number Diff line
@@ -52,7 +52,7 @@ 
 */

#undef START_IN_KERNEL_MODE



#define DRV_VER "0.5.21"

#define DRV_VER "0.5.22"



/*

 * According to the Atom N270 datasheet,
@@ -165,12 +165,9 @@ static const struct bios_settings_t bios_tbl[] = { 
	/* Gateway */

	{"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x21, 0x00} },

	{"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x20, 0x00} },

	{"Gateway         ", "LT31            ", "v1.3103 ", 0x55, 0x58,

		{0x10, 0x0f, 0x00} },

	{"Gateway         ", "LT31            ", "v1.3201 ", 0x55, 0x58,

		{0x10, 0x0f, 0x00} },

	{"Gateway         ", "LT31            ", "v1.3302 ", 0x55, 0x58,

		{0x10, 0x0f, 0x00} },

	{"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x10, 0x0f, 0x00} },

	{"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x10, 0x0f, 0x00} },

	{"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x10, 0x0f, 0x00} },

	/* Packard Bell */

	{"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x21, 0x00} },

	{"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x20, 0x00} },
@@ -495,13 +492,26 @@ static struct platform_driver acerhdf_driver = { 
	.remove = acerhdf_remove,

};



/* checks if str begins with start */

static int str_starts_with(const char *str, const char *start)

{

	unsigned long str_len = 0, start_len = 0;



	str_len = strlen(str);

	start_len = strlen(start);



	if (str_len >= start_len &&

			!strncmp(str, start, start_len))

		return 1;



	return 0;

}



/* check hardware */

static int acerhdf_check_hardware(void)

{

	char const *vendor, *version, *product;

	int i;

	unsigned long prod_len = 0;

	const struct bios_settings_t *bt = NULL;



	/* get BIOS data */

	vendor  = dmi_get_system_info(DMI_SYS_VENDOR);
@@ -523,20 +533,20 @@ static int acerhdf_check_hardware(void) 
		kernelmode = 0;

	}



	prod_len = strlen(product);



	if (verbose)

		pr_info("BIOS info: %s %s, product: %s\n",

			vendor, version, product);



	/* search BIOS version and vendor in BIOS settings table */

	for (i = 0; bios_tbl[i].version[0]; i++) {

		if (strlen(bios_tbl[i].product) >= prod_len &&

		    !strncmp(bios_tbl[i].product, product,

			   strlen(bios_tbl[i].product)) &&

		    !strcmp(bios_tbl[i].vendor, vendor) &&

		    !strcmp(bios_tbl[i].version, version)) {

			bios_cfg = &bios_tbl[i];

	for (bt = bios_tbl; bt->vendor[0]; bt++) {

		/*

		 * check if actual hardware BIOS vendor, product and version

		 * IDs start with the strings of BIOS table entry

		 */

		if (str_starts_with(vendor, bt->vendor) &&

				str_starts_with(product, bt->product) &&

				str_starts_with(version, bt->version)) {

			bios_cfg = bt;

			break;

		}

	}