From 43fe105a5c91b2f00ea7f900ed307fe980410612 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sat, 23 Feb 2008 15:23:55 -0800 Subject: [PATCH] dmi: prevent linked list corruption Adding the same item to a given linked list more than once is guaranteed to break and corrupt the list. This is however what we do in dmi_scan since commit 79da4721117fcf188b4b007b775738a530f574da ("x86: fix DMI out of memory problems"). Given that there is absolutely no interest in saving empty OEM strings anyway, I propose the simple and efficient fix below: we discard the empty OEM strings altogether. Signed-off-by: Jean Delvare Acked-by: Parag Warudkar Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Matt Domsch Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/firmware/dmi_scan.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c index de3027521b..4072449ad1 100644 --- a/drivers/firmware/dmi_scan.c +++ b/drivers/firmware/dmi_scan.c @@ -217,10 +217,6 @@ static void __init dmi_save_devices(const struct dmi_header *dm) } } -static struct dmi_device empty_oem_string_dev = { - .name = dmi_empty_string, -}; - static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) { int i, count = *(u8 *)(dm + 1); @@ -229,10 +225,8 @@ static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) for (i = 1; i <= count; i++) { char *devname = dmi_string(dm, i); - if (!strcmp(devname, dmi_empty_string)) { - list_add(&empty_oem_string_dev.list, &dmi_devices); + if (devname == dmi_empty_string) continue; - } dev = dmi_alloc(sizeof(*dev)); if (!dev) { -- 2.39.5