powerpc/cell: Add of_node_put to avoid memory leak

Author: Julia Lawall <julia@diku.dk>

Add calls to of_node_put in the error handling code following calls to
of_find_node_by_path and of_find_node_by_phandle.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// 
@r exists@
local idexpression x;
expression E,E1;
statement S;
@@

*x =
(of_find_node_by_path
|of_find_node_by_name
|of_find_node_by_phandle
|of_get_parent
|of_get_next_parent
|of_get_next_child
|of_find_compatible_node
|of_match_node
)(...);
...
if (x == NULL) S
<... when != x = E
*if (...) {
  ... when != of_node_put(x)
      when != if (...) { ... of_node_put(x); ... }
(
  return <+...x...+>;
|
*  return ...;
)
}
...>
of_node_put(x);
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Benjamin Herrenschmidt

---
 arch/powerpc/platforms/cell/ras.c        | 4 +++-
 arch/powerpc/platforms/cell/spider-pic.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)
 
diff --git a/arch/powerpc/platforms/cell/ras.c b/arch/powerpc/platforms/cell/ras.c
index 1d3c4ef..5ec1e47 100644
--- a/arch/powerpc/platforms/cell/ras.c
+++ b/arch/powerpc/platforms/cell/ras.c
@@ -173,8 +173,10 @@ static int __init cbe_ptcal_enable(void)
 		return -ENODEV;
 
 	size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
-	if (!size)
+	if (!size) {
+		of_node_put(np);
 		return -ENODEV;
+	}
 
 	pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size);
 	order = get_order(*size);
diff --git a/arch/powerpc/platforms/cell/spider-pic.c b/arch/powerpc/platforms/cell/spider-pic.c
index 5876e88..3f2e557 100644
--- a/arch/powerpc/platforms/cell/spider-pic.c
+++ b/arch/powerpc/platforms/cell/spider-pic.c
@@ -258,8 +258,10 @@ static unsigned int __init spider_find_cascade_and_node(struct spider_pic *pic)
 		return NO_IRQ;
 	imap += intsize + 1;
 	tmp = of_get_property(iic, "#interrupt-cells", NULL);
-	if (tmp == NULL)
+	if (tmp == NULL) {
+		of_node_put(iic);
 		return NO_IRQ;
+	}
 	intsize = *tmp;
 	/* Assume unit is last entry of interrupt specifier */
 	unit = imap[intsize - 1];

powerpc/cell: Add of_node_put to avoid memory leak

qlambert

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