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Don't allow multiwrites against a block device without underlying medium

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If the block device has been closed, we no longer have a medium to submit
IO against, check for this before submitting io.  This prevents a segfault
further in the code where we dereference elements of the block driver.

Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Ryan Harper 2011-03-07 10:01:04 -06:00 committed by Kevin Wolf
parent 4e59b54586
commit 301db7c2dd
1 changed files with 8 additions and 0 deletions
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8
block.c
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@ -2398,6 +2398,14 @@ int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
MultiwriteCB *mcb;
int i;
/* don't submit writes if we don't have a medium */
if (bs->drv == NULL) {
for (i = 0; i < num_reqs; i++) {
reqs[i].error = -ENOMEDIUM;
}
return -1;
}
if (num_reqs == 0) {
return 0;
}