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| author | Stefan Weinhuber <wein@de.ibm.com> | 2009-04-14 15:36:24 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-04-14 15:37:25 +0200 |
| commit | 52db45c3c55a0fca53077dfd7b123e30cd210aad (patch) | |
| tree | e03d3be9d4c9867dad3a2e0d0a58a7363b6ad92a /drivers/s390/block | |
| parent | f3445a1a656bc26b07946cc6d20de1ef07c8d116 (diff) | |
| download | linux-52db45c3c55a0fca53077dfd7b123e30cd210aad.tar.bz2 | |
[S390] dasd: fix idaw boundary checking for track based ccw
A ccw command that reads or writes several records at once will
usually transfer more data then fits into one page and needs to
address memory areas using a list of indirect data address words
(idaw). All but the first of these areas must start on a 4KB or 2KB
block boundary (depending on the idaw format).
A check for this restriction was missing and has been added with
this patch.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 21254793c604..cb52da033f06 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -2019,15 +2019,23 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track( ccw++; recid += count; new_track = 0; + /* first idaw for a ccw may start anywhere */ + if (!idaw_dst) + idaw_dst = dst; } - /* If we start a new idaw, everything is fine and the - * start of the new idaw is the start of this segment. + /* If we start a new idaw, we must make sure that it + * starts on an IDA_BLOCK_SIZE boundary. * If we continue an idaw, we must make sure that the * current segment begins where the so far accumulated * idaw ends */ - if (!idaw_dst) - idaw_dst = dst; + if (!idaw_dst) { + if (__pa(dst) & (IDA_BLOCK_SIZE-1)) { + dasd_sfree_request(cqr, startdev); + return ERR_PTR(-ERANGE); + } else + idaw_dst = dst; + } if ((idaw_dst + idaw_len) != dst) { dasd_sfree_request(cqr, startdev); return ERR_PTR(-ERANGE); |