ipr: Fix incorrect trace indexing

When ipr's internal driver trace was changed to an atomic, a signed/unsigned
bug slipped in which results in us indexing backwards in our memory buffer
writing on memory that does not belong to us. This patch fixes this by removing
the modulo and instead just mask off the low bits.

Cc: <stable@vger.kernel.org>
Tested-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@linux.vnet.ibm.com>
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

2 files changed, 4 insertions, 2 deletions

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 486ffaf5109a..7ae9cd743eb2 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -599,9 +599,10 @@ static void ipr_trc_hook(struct ipr_cmnd *ipr_cmd,
 {
         struct ipr_trace_entry *trace_entry;
         struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
+        unsigned int trace_index;
 
-        trace_entry = &ioa_cfg->trace[atomic_add_return
-                        (1, &ioa_cfg->trace_index)%IPR_NUM_TRACE_ENTRIES];
+        trace_index = atomic_add_return(1, &ioa_cfg->trace_index) & IPR_TRACE_INDEX_MASK;
+        trace_entry = &ioa_cfg->trace[trace_index];
         trace_entry->time = jiffies;
         trace_entry->op_code = ipr_cmd->ioarcb.cmd_pkt.cdb[0];
         trace_entry->type = type;
diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index 73790a1d0969..6b97ee45c7b4 100644
--- a/drivers/scsi/ipr.h
+++ b/drivers/scsi/ipr.h
@@ -1486,6 +1486,7 @@ struct ipr_ioa_cfg {
 
 #define IPR_NUM_TRACE_INDEX_BITS        8
 #define IPR_NUM_TRACE_ENTRIES           (1 << IPR_NUM_TRACE_INDEX_BITS)
+#define IPR_TRACE_INDEX_MASK            (IPR_NUM_TRACE_ENTRIES - 1)
 #define IPR_TRACE_SIZE  (sizeof(struct ipr_trace_entry) * IPR_NUM_TRACE_ENTRIES)
         char trace_start[8];
 #define IPR_TRACE_START_LABEL                   "trace"