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smb311_decode_neg_context() doesn't properly check against SMB packet boundaries prior to accessing individual negotiate context entries. This is due to the length check omitting the eight byte smb2_neg_context header, as well as incorrect decrementing of len_of_ctxts. Fixes: 5100d8a ("SMB311: Improve checking of negotiate security contexts") Reported-by: Volker Lendecke <[email protected]> Reviewed-by: Paulo Alcantara (SUSE) <[email protected]> Signed-off-by: David Disseldorp <[email protected]> Signed-off-by: Steve French <[email protected]>
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