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Potential Null dereference

From: Mansour Ahmadi
Subject: Potential Null dereference
Date: Mon, 23 Mar 2020 23:05:08 -0400
Hi,

Nullness of  needs to be checked here:
https://github.com/qemu/qemu/blob/c532b954d96f96d361ca31308f75f1b95bd4df76/block/commit.c#L221

pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),...

While it is done at 2 other locations:
https://github.com/qemu/qemu/blob/c532b954d96f96d361ca31308f75f1b95bd4df76/block/backup-top.c#L113
https://github.com/qemu/qemu/blob/c532b954d96f96d361ca31308f75f1b95bd4df76/block/mirror.c#L1477

if (bs->backing == NULL) { return}

Thanks,
Mansour

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