libata: reject passthrough WRITE SAME requests

[pandora-kernel.git] / drivers / ata / libata-scsi.c

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index eeadf8f..01a019e 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3056,6 +3056,14 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
        if (unlikely(!dev->dma_mode))
                goto invalid_fld;
 
+       /*
+        * We only allow sending this command through the block layer,
+        * as it modifies the DATA OUT buffer, which would corrupt user
+        * memory for SG_IO commands.
+        */
+       if (unlikely(scmd->request->cmd_type != REQ_TYPE_FS))
+               goto invalid_fld;
+
        if (unlikely(scmd->cmd_len < 16))
                goto invalid_fld;
        scsi_16_lba_len(cdb, &block, &n_block);