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qga: check bytes count read by guest-file-read While reading file content via 'guest-file-read' command, 'qmp_guest_file_read' routine allocates buffer of count+1 bytes. It could overflow for large values of 'count'. Add check to avoid it. Affects qemu < v3.0.0 (From OE-Core rev: a11c8ee86007f7f7a34b9dc29d01acc323b71873) Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com> Signed-off-by: Armin Kuster <akuster808@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>