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Re: [Qemu-block] [PATCH] block/vmdk: Report failures in vmdk_read_cid()

From: Fam Zheng
Subject: Re: [Qemu-block] [PATCH] block/vmdk: Report failures in vmdk_read_cid()
Date: Mon, 10 Jul 2017 09:58:24 +0800
User-agent: Mutt/1.8.0 (2017-02-23)

On Sun, 07/09 18:06, Peter Maydell wrote:
> The function vmdk_read_cid() can fail if the read on the underlying
> block device fails, or if there's a format error in the VMDK file.
> However its API doesn't provide a mechanism to report these errors,
> and in some cases we were returning a CID of 0 and in some cases a
> CID of 0xffffffff, either of which might potentially be valid values.
> Change the function to return 0 on success or a negative errno, and
> return the CID via a uint32_t* argument. Update the callsites to
> handle and propagate the error appropriately.
> This fixes in passing a Coverity-spotted issue (CID 1350038) where
> we weren't checking the return value from sscanf().
> Signed-off-by: Peter Maydell <address@hidden>

Reviewed-by: Fam Zheng <address@hidden>

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