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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 79da472111 ("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 <khali@linux-fr.org>
Acked-by: Parag Warudkar <parag.warudkar@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jean Delvare 2008-02-23 15:23:55 -08:00 committed by Linus Torvalds
parent 79306a340c
commit 43fe105a5c
1 changed files with 1 additions and 7 deletions
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8
drivers/firmware/dmi_scan.c
View File

@ -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) static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
{ {
int i, count = *(u8 *)(dm + 1); 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++) { for (i = 1; i <= count; i++) {
char *devname = dmi_string(dm, i); char *devname = dmi_string(dm, i);
if (!strcmp(devname, dmi_empty_string)) { if (devname == dmi_empty_string)
list_add(&empty_oem_string_dev.list, &dmi_devices);
continue; continue;
}
dev = dmi_alloc(sizeof(*dev)); dev = dmi_alloc(sizeof(*dev));
if (!dev) { if (!dev) {