[Qemu-devel] [PATCH] cris-dis: Clean memory allocation

[Qemu-devel] [PATCH] cris-dis: Clean memory allocation

[Stefan Weil]

The old code used sizeof(const struct cris_opcode **) where it should
have used sizeof(const struct cris_opcode *). As both sizes give the
same value, the resulting binary was ok, but static code analyzers
like coverity and clang complained.

This is fixed here, and the code is also simplified by using g_new0.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 cris-dis.c |   34 ++++++----------------------------
 1 files changed, 6 insertions(+), 28 deletions(-)

diff --git a/cris-dis.c b/cris-dis.c
index 5b8e90b..1d174ba 100644
--- a/cris-dis.c
+++ b/cris-dis.c
@@ -1396,34 +1396,12 @@ get_opcode_entry (unsigned int insn,
   /* Allocate and clear the opcode-table.  */
   if (opc_table == NULL)
     {
-      opc_table = g_malloc (65536 * sizeof (opc_table[0]));
-
-      memset (opc_table, 0, 65536 * sizeof (const struct cris_opcode *));
-
-      dip_prefixes
-	= g_malloc (65536 * sizeof (const struct cris_opcode **));
-
-      memset (dip_prefixes, 0, 65536 * sizeof (dip_prefixes[0]));
-
-      bdapq_m1_prefixes
-	= g_malloc (65536 * sizeof (const struct cris_opcode **));
-
-      memset (bdapq_m1_prefixes, 0, 65536 * sizeof (bdapq_m1_prefixes[0]));
-
-      bdapq_m2_prefixes
-	= g_malloc (65536 * sizeof (const struct cris_opcode **));
-
-      memset (bdapq_m2_prefixes, 0, 65536 * sizeof (bdapq_m2_prefixes[0]));
-
-      bdapq_m4_prefixes
-	= g_malloc (65536 * sizeof (const struct cris_opcode **));
-
-      memset (bdapq_m4_prefixes, 0, 65536 * sizeof (bdapq_m4_prefixes[0]));
-
-      rest_prefixes
-	= g_malloc (65536 * sizeof (const struct cris_opcode **));
-
-      memset (rest_prefixes, 0, 65536 * sizeof (rest_prefixes[0]));
+      opc_table = g_new0(const struct cris_opcode *, 65536);
+      dip_prefixes = g_new0(const struct cris_opcode *, 65536);
+      bdapq_m1_prefixes = g_new0(const struct cris_opcode *, 65536);
+      bdapq_m2_prefixes = g_new0(const struct cris_opcode *, 65536);
+      bdapq_m4_prefixes = g_new0(const struct cris_opcode *, 65536);
+      rest_prefixes = g_new0(const struct cris_opcode *, 65536);
     }
 
   /* Get the right table if this is a prefix.
-- 
1.7.2.5

Re: [Qemu-devel] [PATCH] cris-dis: Clean memory allocation

[Edgar E. Iglesias]

On Mon, Jan 09, 2012 at 07:23:42PM +0100, Stefan Weil wrote:
> The old code used sizeof(const struct cris_opcode **) where it should
> have used sizeof(const struct cris_opcode *). As both sizes give the
> same value, the resulting binary was ok, but static code analyzers
> like coverity and clang complained.
> 
> This is fixed here, and the code is also simplified by using g_new0.
> 
> Signed-off-by: Stefan Weil <sw@weilnetz.de>

Applied, thanks Stefan.

Cheers