firmware: dmi_scan: Prevent dmi_num integer overflow

dmi_num is a u16, dmi_len is a u32, so this construct:

	dmi_num = dmi_len / 4;

would result in an integer overflow for a DMI table larger than
256 kB. I've never see such a large table so far, but SMBIOS 3.0
makes it possible so maybe we'll see such tables in the future.

So instead of faking a structure count when the entry point does
not provide it, adjust the loop condition in dmi_table() to properly
deal with the case where dmi_num is not set.

This bug was introduced with the initial SMBIOS 3.0 support in commit
fc43026278b2 ("dmi: add support for SMBIOS 3.0 64-bit entry point").

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Cc: <stable@vger.kernel.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 69fac06..2eebd28 100644 (file)
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -86,10 +86,13 @@ static void dmi_table(u8 *buf, u32 len, int num,
        int i = 0;
 
        /*
-        *      Stop when we see all the items the table claimed to have
-        *      OR we run off the end of the table (also happens)
+        * Stop when we have seen all the items the table claimed to have
+        * (SMBIOS < 3.0 only) OR we reach an end-of-table marker OR we run
+        * off the end of the table (should never happen but sometimes does
+        * on bogus implementations.)
         */
-       while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
+       while ((!num || i < num) &&
+              (data - buf + sizeof(struct dmi_header)) <= len) {
                const struct dmi_header *dm = (const struct dmi_header *)data;
 
                /*
@@ -529,21 +532,10 @@ static int __init dmi_smbios3_present(const u8 *buf)
        if (memcmp(buf, "_SM3_", 5) == 0 &&
            buf[6] < 32 && dmi_checksum(buf, buf[6])) {
                dmi_ver = get_unaligned_be16(buf + 7);
+               dmi_num = 0;                    /* No longer specified */
                dmi_len = get_unaligned_le32(buf + 12);
                dmi_base = get_unaligned_le64(buf + 16);
 
-               /*
-                * The 64-bit SMBIOS 3.0 entry point no longer has a field
-                * containing the number of structures present in the table.
-                * Instead, it defines the table size as a maximum size, and
-                * relies on the end-of-table structure type (#127) to be used
-                * to signal the end of the table.
-                * So let's define dmi_num as an upper bound as well: each
-                * structure has a 4 byte header, so dmi_len / 4 is an upper
-                * bound for the number of structures in the table.
-                */
-               dmi_num = dmi_len / 4;
-
                if (dmi_walk_early(dmi_decode) == 0) {
                        pr_info("SMBIOS %d.%d present.\n",
                                dmi_ver >> 8, dmi_ver & 0xFF);