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gdbstub: Fix buffer overflows in gdb_handle_packet()
Some places in gdb_handle_packet() can get an arbitrary length (most times directly from the client) and either didn't check it at all or checked against the wrong value, potentially causing buffer overflows. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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