Fix CVE-2019-12067 AHCI emulator while committing DMA buffer in ahci_commit_buf() may do a NULL dereference if the command header 'ad->cur_cmd' is null. Add check to avoid it. Reported-by: Bugs SysSec <address@hidden> Signed-off-by: Prasad J Pandit <address@hidden> Signed-off-by: Jiajie Li <lijiajie11@huawei.com>
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