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-rw-r--r--drivers/s390/block/dasd_eckd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 4e7b55a14b1a..6e294b4d3635 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -4469,6 +4469,14 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp)
usrparm.psf_data &= 0x7fffffffULL;
usrparm.rssd_result &= 0x7fffffffULL;
}
+ /* at least 2 bytes are accessed and should be allocated */
+ if (usrparm.psf_data_len < 2) {
+ DBF_DEV_EVENT(DBF_WARNING, device,
+ "Symmetrix ioctl invalid data length %d",
+ usrparm.psf_data_len);
+ rc = -EINVAL;
+ goto out;
+ }
/* alloc I/O data area */
psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);