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authorSteffen Maier <maier@linux.vnet.ibm.com>2012-09-04 15:23:31 +0200
committerJames Bottomley <JBottomley@Parallels.com>2012-09-24 12:11:01 +0400
commit01e60527f0a49b3d7df603010bd6079bb4b6cf07 (patch)
tree5683b67c13a599c43d75f038a341f9dd79c49147 /drivers/s390/scsi/zfcp_qdio.c
parent0100998dbfe6dfcd90a6e912ca7ed6f255d48f25 (diff)
[SCSI] zfcp: Bounds checking for deferred error trace
The pl vector has scount elements, i.e. pl[scount-1] is the last valid element. For maximum sized requests, payload->counter == scount after the last loop iteration. Therefore, do bounds checking first (with boolean shortcut) to not access the invalid element pl[scount]. Do not trust the maximum sbale->scount value from the HBA but ensure we won't access the pl vector out of our allocated bounds. While at it, clean up scoping and prevent unnecessary memset. Minor fix for 86a9668a8d29ea711613e1cb37efa68e7c4db564 "[SCSI] zfcp: support for hardware data router" Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com> Reviewed-by: Martin Peschke <mpeschke@linux.vnet.ibm.com> Cc: <stable@vger.kernel.org> #3.2+ Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/s390/scsi/zfcp_qdio.c')
-rw-r--r--drivers/s390/scsi/zfcp_qdio.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index b9fffc8d94a7..50b5615848f6 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -102,18 +102,22 @@ static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
{
struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
struct zfcp_adapter *adapter = qdio->adapter;
- struct qdio_buffer_element *sbale;
int sbal_no, sbal_idx;
- void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
- u64 req_id;
- u8 scount;
if (unlikely(qdio_err)) {
- memset(pl, 0, ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
if (zfcp_adapter_multi_buffer_active(adapter)) {
+ void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
+ struct qdio_buffer_element *sbale;
+ u64 req_id;
+ u8 scount;
+
+ memset(pl, 0,
+ ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
sbale = qdio->res_q[idx]->element;
req_id = (u64) sbale->addr;
- scount = sbale->scount + 1; /* incl. signaling SBAL */
+ scount = min(sbale->scount + 1,
+ ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
+ /* incl. signaling SBAL */
for (sbal_no = 0; sbal_no < scount; sbal_no++) {
sbal_idx = (idx + sbal_no) %