[Libburn] patch preventing pointer error in libburn/sector.c

[scdbackup at gmx.net]

Hi,

attached is a small patch for a potential bug in
sector.c:get_bytes() (CVS version of today).

It would occur if  read(2)  returns -1 and no further
source is available in the link chain :

        valid = src->read(src, data, count);
        shortage = count - valid;
        ...
        if (shortage) {
                if (src->next) {
                        ...
                }
                memset(data + valid, 0, shortage);

This would copy count+1 zeros to address  data-1  (!).

The remedy is, of course, to set valid to 0 in this case.


Have a nice day :)

Thomas

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