ppc/pnv: check return value of blk_pwrite()

When updating the PNOR file contents, we should check for a possible
failure of blk_pwrite().

Fixes Coverity issue CID 1412228.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20200107171809.15556-2-clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/ppc/pnv_pnor.c b/hw/ppc/pnv_pnor.c
index bfb1e92b0392821a358ae88688f0c4e1ed51a75c..0e86ae2feae673ebe6383a744373184f824b52fd 100644 (file)
--- a/hw/ppc/pnv_pnor.c
+++ b/hw/ppc/pnv_pnor.c
@@ -33,6 +33,7 @@ static uint64_t pnv_pnor_read(void *opaque, hwaddr addr, unsigned size)
 static void pnv_pnor_update(PnvPnor *s, int offset, int size)
 {
     int offset_end;
+    int ret;
 
     if (s->blk) {
         return;
@@ -42,8 +43,11 @@ static void pnv_pnor_update(PnvPnor *s, int offset, int size)
     offset = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
     offset_end = QEMU_ALIGN_UP(offset_end, BDRV_SECTOR_SIZE);
 
-    blk_pwrite(s->blk, offset, s->storage + offset,
-               offset_end - offset, 0);
+    ret = blk_pwrite(s->blk, offset, s->storage + offset,
+                     offset_end - offset, 0);
+    if (ret < 0) {
+        error_report("Could not update PNOR: %s", strerror(-ret));
+    }
 }
 
 static void pnv_pnor_write(void *opaque, hwaddr addr, uint64_t data,