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aeea0c2804
Check that the iovec containing struct virtio_scsi_inhdr is large enough
before storing an error value there.
Feifan Qian <bea1e@proton.me> pointed out that this can be used to
corrupt heap memory when the descriptor uses an MMIO address and a
length of 1, forcing QEMU to allocate a 1-byte heap bounce buffer.
virtio_stl_p() stores 4 bytes and therefore corrupts whatever is beyond
the bounce buffer.
Fixes: CVE-2026-48914
Fixes: f34e73cd69 ("virtio-blk: report non-zero status when failing SG_IO requests")
Reported-by: Feifan Qian <bea1e@proton.me>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20260526154957.1741622-1-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>