a02091834d
While it is possible for the return value from zfs_log2() to be zero (0), it is quite unlikely, given that the previous assignment to blksz is shifted up by SPA_MINBLOCKSHIFT (9) before 9 is subtracted at the assignment to epbs. But, while unlikely during a normal operation, it may be that a carefully crafted ZFS filesystem could result in a zero (0) value to the dn_datalbkszsec field, which means that the shift left does nothing and assigns zero (0) to blksz, resulting in a negative epbs value. Fixes: CID 73608 Signed-off-by: Darren Kenny <darren.kenny@oracle.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'