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imsm: fix insufficient mpb buffer allocation 

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2008-06-21 00:19:53 -07:00
parent ad97895ec8
commit 2c092cada6
1 changed files with 19 additions and 0 deletions
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19
super-intel.c
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@ -1039,6 +1039,7 @@ static int init_super_imsm_volume(struct supertype *st, mdu_array_info_t *info,
unsigned long long array_blocks;
unsigned long long sz;
__u32 offset = 0;
size_t size_old, size_new;
if (mpb->num_raid_devs >= 2) {
fprintf(stderr, Name": This imsm-container already has the "
@ -1046,6 +1047,24 @@ static int init_super_imsm_volume(struct supertype *st, mdu_array_info_t *info,
return 0;
}
/* ensure the mpb is large enough for the new data */
size_old = __le32_to_cpu(mpb->mpb_size);
size_new = disks_to_mpb_size(info->nr_disks);
if (size_new > size_old) {
void *mpb_new;
size_t size_round = ROUND_UP(size_new, 512);
if (posix_memalign(&mpb_new, 512, size_round) != 0) {
fprintf(stderr, Name": could not allocate new mpb\n");
return 0;
}
memcpy(mpb_new, mpb, size_old);
free(mpb);
mpb = mpb_new;
super->mpb = mpb_new;
mpb->mpb_size = __cpu_to_le32(size_new);
memset(mpb_new + size_old, 0, size_round - size_old);
}
super->current_vol = idx;
sprintf(st->subarray, "%d", idx);
mpb->num_raid_devs++;