Hello Phillip! > In sd_revalidate_disk, if sdkp->media_present is set, then sdkp->capacity > should not be zero. Therefore, jump to end of if block and skip remaining > checks/calls. Fixes a KMSAN-found uninit-value bug reported by syzbot at: > https://syzkaller.appspot.com/bug?id=197c8a3a2de61720a9b500ad485a7aba0065c6af The reported read of an uninitialized value is in scsi_mode_sense() while inspecting a buffer returned from sending a MODE SENSE command to the device. The buffer in question is memset() before executing the MODE SENSE command. And we only look at the buffer contents if the MODE SENSE operation was successful. As far as I can tell the only way to end up reading uninitialized data is if the device successfully completes the command but fails to transfer the data buffer. But maybe I'm missing something? -- Martin K. Petersen Oracle Linux Engineering
