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authorStefan Weinhuber <wein@de.ibm.com>2013-11-19 14:15:57 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-11-20 09:04:54 +0100
commit26a35f373fbe6f21e8ad5ca4de1c01021e38fe2f (patch)
tree1e0ac74c9336553c6dfd86cdcbf86c7ba969379e /drivers/s390
parentaa7e04b3808614980d474735cdb0bf35ac5cdf26 (diff)
downloadlinux-26a35f373fbe6f21e8ad5ca4de1c01021e38fe2f.tar.bz2
s390/dasd: validate request size before building CCW/TCW request
An I/O request that does not read or write full blocks cannot be translated into a correct CCW or TCW program and should be rejected right away. In particular the code that creates TCW requests will not notice this problem and create broken TCWs that will be rejected by the hardware. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Reference-ID: RQM1956
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/block/dasd_eckd.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index cee7e2708a1f..95e45782692f 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -3224,6 +3224,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
fcx_multitrack = private->features.feature[40] & 0x20;
data_size = blk_rq_bytes(req);
+ if (data_size % blksize)
+ return ERR_PTR(-EINVAL);
/* tpm write request add CBC data on each track boundary */
if (rq_data_dir(req) == WRITE)
data_size += (last_trk - first_trk) * 4;