kernel: crashlog: Avoid out-of-bounds write
vsnprintf returns the number of chars that would have been written, not the actual number of chars written. This can lead to crashlog_buf->len being too big which in turn can lead to get_maxlen() returning negative numbers. The length argument of kmsg_dump_get_buffer will be casted to a size_t which makes a negative input a big positive number allowing kmsg_dump_get_buffer to write out of bounds. Fix this by using vscnprintf which returns the actually written number of chars. Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> SVN-Revision: 37820v19.07.3_mercusys_ac12_duma
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