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firmware: dmi_scan: Fix UUID length safety check
[ Upstream commit90fe6f8ff0
] The test which ensures that the DMI type 1 structure is long enough to hold the UUID is off by one. It would fail if the structure is exactly 24 bytes long, while that's sufficient to hold the UUID. I don't expect this bug to cause problem in practice because all implementations I have seen had length 8, 25 or 27 bytes, in line with the SMBIOS specifications. But let's fix it still. Signed-off-by: Jean Delvare <jdelvare@suse.de> Fixes:a814c3597a
("firmware: dmi_scan: Check DMI structure length") Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -191,7 +191,7 @@ static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
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char *s;
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int is_ff = 1, is_00 = 1, i;
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if (dmi_ident[slot] || dm->length <= index + 16)
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if (dmi_ident[slot] || dm->length < index + 16)
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return;
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d = (u8 *) dm + index;
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