diff options
| author | Steven Clarkson <sc@lambdal.com> | 2020-01-30 16:48:16 -0800 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-01-31 20:03:23 +0100 |
| commit | 2b73ea3796242608b4ccf019ff217156c92e92fe (patch) | |
| tree | 766669a6b7bdd129458682853dc925a6c7a4932a | |
| parent | 979923871f69a4dc926658f9f9a1a4c1bde57552 (diff) | |
x86/boot: Handle malformed SRAT tables during early ACPI parsing
Break an infinite loop when early parsing of the SRAT table is caused
by a subtable with zero length. Known to affect the ASUS WS X299 SAGE
motherboard with firmware version 1201 which has a large block of
zeros in its SRAT table. The kernel could boot successfully on this
board/firmware prior to the introduction of early parsing this table or
after a BIOS update.
[ bp: Fixup whitespace damage and commit message. Make it return 0 to
denote that there are no immovable regions because who knows what
else is broken in this BIOS. ]
Fixes: 02a3e3cdb7f1 ("x86/boot: Parse SRAT table and count immovable memory regions")
Signed-off-by: Steven Clarkson <sc@lambdal.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: linux-acpi@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206343
Link: https://lkml.kernel.org/r/CAHKq8taGzj0u1E_i=poHUam60Bko5BpiJ9jn0fAupFUYexvdUQ@mail.gmail.com
| -rw-r--r-- | arch/x86/boot/compressed/acpi.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index 25019d42ae93..ef2ad7253cd5 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -393,7 +393,13 @@ int count_immovable_mem_regions(void) table = table_addr + sizeof(struct acpi_table_srat); while (table + sizeof(struct acpi_subtable_header) < table_end) { + sub_table = (struct acpi_subtable_header *)table; + if (!sub_table->length) { + debug_putstr("Invalid zero length SRAT subtable.\n"); + return 0; + } + if (sub_table->type == ACPI_SRAT_TYPE_MEMORY_AFFINITY) { struct acpi_srat_mem_affinity *ma; |