does "block: add secure discard" cause an overflow?
This is the commit 8d57a98ccd0b44 "block: add secure discard".
The patch adds a letter 'E' to the string in blk_fill_rwbs(). if (rw & REQ_SECURE) rwbs[i++] = 'E';
The problem is that "rwbs" is a 6 character buffer and if all the flags are set the we'd get "WABSME" which would put us off the end (when you add the NUL terminator).