Re: [PATCH] Allocate pnp resources dynamically via krealloc
- From: "Pekka Enberg" <penberg@xxxxxxxxxxxxxx>
- Date: Sun, 20 Jan 2008 02:23:13 +0200
Hi Thomas,
On Jan 19, 2008 10:00 PM, Thomas Renninger <trenn@xxxxxxx> wrote:
+static int pnp_alloc_port(struct pnp_resource_table *res)
+{
[snip]
+ res->port_resource = krealloc(res->port_resource,
+ (sizeof(struct resource) * res->allocated_ports)
+ + (sizeof(struct resource) * PNP_ALLOC_PORT), GFP_KERNEL);
+
+ if (!res->port_resource)
+ return -ENOMEM;
When krealloc() returns NULL, there wasn't enough memory to fit the
new size but the original memory region remains unchanged. Therefore
you must not unconditionally overwrite the res->port_resource with the
return value of krealloc(); otherwise you might leak memory.
Pekka
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