From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Sat, 15 May 2021 16:07:47 +0000 (+0200)
Subject: smbios: error handling for invalid addresses
X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/%7B%7B%20%24style.Permalink%20%7D%7D?a=commitdiff_plain;h=c193d9bd284565df4ddcdd1e9190d2ce718e9eb7;p=u-boot.git

smbios: error handling for invalid addresses

SMBIOS tables only support 32bit addresses. If we don't have memory here
handle the error gracefully:

* on x86_64 fail to start U-Boot
* during UEFI booting ignore the missing table

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
---

diff --git a/arch/x86/lib/tables.c b/arch/x86/lib/tables.c
index 1779bb3e11..ea834a5035 100644
--- a/arch/x86/lib/tables.c
+++ b/arch/x86/lib/tables.c
@@ -3,6 +3,8 @@
  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
  */
 
+#define LOG_CATEGORY LOGC_BOARD
+
 #include <common.h>
 #include <bloblist.h>
 #include <log.h>
@@ -96,13 +98,20 @@ int write_tables(void)
 				return log_msg_ret("bloblist", -ENOBUFS);
 		}
 		rom_table_end = table->write(rom_table_start);
-		rom_table_end = ALIGN(rom_table_end, ROM_TABLE_ALIGN);
+		if (!rom_table_end) {
+			log_err("Can't create configuration table %d\n", i);
+			return -EINTR;
+		}
 
 		if (IS_ENABLED(CONFIG_SEABIOS)) {
 			table_size = rom_table_end - rom_table_start;
 			high_table = (u32)(ulong)high_table_malloc(table_size);
 			if (high_table) {
-				table->write(high_table);
+				if (!table->write(high_table)) {
+					log_err("Can't create configuration table %d\n",
+						i);
+					return -EINTR;
+				}
 
 				cfg_tables[i].start = high_table;
 				cfg_tables[i].size = table_size;
diff --git a/include/smbios.h b/include/smbios.h
index fc49fc10b9..aa6b6f3849 100644
--- a/include/smbios.h
+++ b/include/smbios.h
@@ -229,8 +229,11 @@ static inline void fill_smbios_header(void *table, int type,
  * This writes SMBIOS table at a given address.
  *
  * @addr:	start address to write SMBIOS table. If this is not
- *	16-byte-aligned then it will be aligned before the table is written
- * @return:	end address of SMBIOS table (and start address for next entry)
+ *		16-byte-aligned then it will be aligned before the table is
+ *		written.
+ * Return:	end address of SMBIOS table (and start address for next entry)
+ *		or NULL in case of an error
+ *
  */
 ulong write_smbios_table(ulong addr);
 
diff --git a/lib/efi_loader/efi_smbios.c b/lib/efi_loader/efi_smbios.c
index 719d3e8880..2eb4cb1c1a 100644
--- a/lib/efi_loader/efi_smbios.c
+++ b/lib/efi_loader/efi_smbios.c
@@ -5,6 +5,8 @@
  *  Copyright (c) 2016 Alexander Graf
  */
 
+#define LOG_CATEGORY LOGC_EFI
+
 #include <common.h>
 #include <efi_loader.h>
 #include <log.h>
@@ -43,14 +45,13 @@ efi_status_t efi_smbios_register(void)
 	 * Generate SMBIOS tables - we know that efi_allocate_pages() returns
 	 * a 4k-aligned address, so it is safe to assume that
 	 * write_smbios_table() will write the table at that address.
-	 *
-	 * Note that on sandbox, efi_allocate_pages() unfortunately returns a
-	 * pointer even though it uses a uint64_t type. Convert it.
 	 */
 	assert(!(dmi_addr & 0xf));
 	dmi = (void *)(uintptr_t)dmi_addr;
-	write_smbios_table(map_to_sysmem(dmi));
-
-	/* And expose them to our EFI payload */
-	return efi_install_configuration_table(&smbios_guid, dmi);
+	if (write_smbios_table(map_to_sysmem(dmi)))
+		/* Install SMBIOS information as configuration table */
+		return efi_install_configuration_table(&smbios_guid, dmi);
+	efi_free_pages(dmi_addr, 1);
+	log_err("Cannot create SMBIOS table\n");
+	return EFI_SUCCESS;
 }
diff --git a/lib/smbios.c b/lib/smbios.c
index a892716d15..d7f4999e8b 100644
--- a/lib/smbios.c
+++ b/lib/smbios.c
@@ -530,7 +530,8 @@ ulong write_smbios_table(ulong addr)
 		 */
 		printf("WARNING: SMBIOS table_address overflow %llx\n",
 		       (unsigned long long)table_addr);
-		table_addr = 0;
+		addr = 0;
+		goto out;
 	}
 	se->struct_table_address = table_addr;
 
@@ -541,6 +542,7 @@ ulong write_smbios_table(ulong addr)
 	isize = sizeof(struct smbios_entry) - SMBIOS_INTERMEDIATE_OFFSET;
 	se->intermediate_checksum = table_compute_checksum(istart, isize);
 	se->checksum = table_compute_checksum(se, sizeof(struct smbios_entry));
+out:
 	unmap_sysmem(se);
 
 	return addr;