Adding range-check before the offending code in grub-
core/kern/emu/hostdisk.c fixes this symptom for me. Underlying cause may
be deeper though.
int
grub_util_biosdisk_is_floppy (grub_disk_t disk)
{
struct stat st;
int fd;
/* Shouldn't happen. See LP#916435. */
if (disk->id > sizeof(map) / sizeof(*map))
return 0;
fd = open (map[disk->id].device, O_RDONLY);
/* Shouldn't happen. */
if (fd == -1)
return 0;
/* Shouldn't happen either. */
if (fstat (fd, &st) < 0)
return 0;
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https://bugs.launchpad.net/bugs/916435
Title:
grub-setup crashed with SEGV in grub_util_biosdisk_is_floppy()
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