scsi: mpt3sas: Fix memset() in non-RDPQ mode

Fix memset() accessing out of range address when reply_queue count is less
than RDPQ_MAX_INDEX_IN_ONE_CHUNK (i.e. 16) in non-RDPQ mode.

In non-RDPQ mode, the driver allocates a single contiguous pool of size
reply_queue's count * reqly_post_free_sz. But the driver is always
memsetting this pool with size 16 * reqly_post_free_sz. If reply queue
count is less than 16 (i.e. when MSI-X vectors enabled < 16), the driver is
accessing out of range address and this results in 'BUG: unable to handle
kernel paging request at fff0x...x' bug.

Make driver use dma_pool_zalloc() API to allocate and zero the pool.

Link: https://lore.kernel.org/r/20200528145617.27252-1-suganath-prabu.subramani@broadcom.com
Fixes: 8012209eb26b ("scsi: mpt3sas: Handle RDPQ DMA allocation in same 4G region")
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index beaea19..96b78fd 100644 (file)
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -4984,7 +4984,7 @@ base_alloc_rdpq_dma_pool(struct MPT3SAS_ADAPTER *ioc, int sz)
        for (i = 0; i < count; i++) {
                if ((i % RDPQ_MAX_INDEX_IN_ONE_CHUNK == 0) && dma_alloc_count) {
                        ioc->reply_post[i].reply_post_free =
-                           dma_pool_alloc(ioc->reply_post_free_dma_pool,
+                           dma_pool_zalloc(ioc->reply_post_free_dma_pool,
                                GFP_KERNEL,
                                &ioc->reply_post[i].reply_post_free_dma);
                        if (!ioc->reply_post[i].reply_post_free)
@@ -5008,9 +5008,6 @@ base_alloc_rdpq_dma_pool(struct MPT3SAS_ADAPTER *ioc, int sz)
                                    ioc->reply_post[i].reply_post_free_dma));
                                return -EAGAIN;
                        }
-                       memset(ioc->reply_post[i].reply_post_free, 0,
-                                               RDPQ_MAX_INDEX_IN_ONE_CHUNK *
-                                               reply_post_free_sz);
                        dma_alloc_count--;
 
                } else {