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Andrey Konovalov reported a possible out-of-bounds problem for the
cdc_parse_cdc_header function. He writes:
It looks like cdc_parse_cdc_header() doesn't validate buflen
before accessing buffer[1], buffer[2] and so on. The only check
present is while (buflen > 0).
So fix this issue up by properly validating the buffer length matches
what the descriptor says it is.
(cherry picked from commit 2e1c42391ff2556387b3cb6308b24f6f65619feb)
(The original patch fixed the generic cdc_parser_cdc_header function.
That generic function did not exist in 3.10 but there are a couple
cdc parsers that suffer from the same underlying problem.)
Bug: 69052594
Change-Id: Ib251469de39e51b0ed7c1a1b88873270afccd90f
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Marissa Wall <marissaw@google.com>
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