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luks: Turn another invalid assertion into check

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Commit e39e959e fixed an invalid assertion in the .bdrv_length
implementation, but left a similar assertion in place for
.bdrv_truncate. Instead of crashing when the user requests a too large
image size, fail gracefully.

A file size of exactly INT64_MAX caused failure before, but is actually
legal.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Kevin Wolf 2018-03-20 16:38:51 +01:00
parent 633c175f8c
commit 120bc742c0
1 changed files with 5 additions and 1 deletions
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6
block/crypto.c
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@ -357,7 +357,11 @@ static int block_crypto_truncate(BlockDriverState *bs, int64_t offset,
BlockCrypto *crypto = bs->opaque;
uint64_t payload_offset =
qcrypto_block_get_payload_offset(crypto->block);
assert(payload_offset < (INT64_MAX - offset));
if (payload_offset > INT64_MAX - offset) {
error_setg(errp, "The requested file size is too large");
return -EFBIG;
}
offset += payload_offset;