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authorChuck Lever <chuck.lever@oracle.com>2007-05-08 18:23:28 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-05-09 17:57:59 -0400
commitaa3d1faebe6e214cd96be0e587571477ff6fd9fc (patch)
treed2295c15e30437a2bc693bd71b79a42c742ffc8b /net/sunrpc/sched.c
parente70c490810dc683fad39e57cf00e69d5f120c542 (diff)
SUNRPC: Fix pointer arithmetic bug recently introduced in rpc_malloc/free
Use a cleaner method to find the size of an rpc_buffer. This actually works on x86-64! Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/sched.c')
-rw-r--r--net/sunrpc/sched.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 99014516b73..b28a0b037f4 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -736,6 +736,11 @@ static void rpc_async_schedule(struct work_struct *work)
__rpc_execute(container_of(work, struct rpc_task, u.tk_work));
}
+struct rpc_buffer {
+ size_t len;
+ char data[];
+};
+
/**
* rpc_malloc - allocate an RPC buffer
* @task: RPC task that will use this buffer
@@ -754,18 +759,18 @@ static void rpc_async_schedule(struct work_struct *work)
*/
void *rpc_malloc(struct rpc_task *task, size_t size)
{
- size_t *buf;
+ struct rpc_buffer *buf;
gfp_t gfp = RPC_IS_SWAPPER(task) ? GFP_ATOMIC : GFP_NOWAIT;
- size += sizeof(size_t);
+ size += sizeof(struct rpc_buffer);
if (size <= RPC_BUFFER_MAXSIZE)
buf = mempool_alloc(rpc_buffer_mempool, gfp);
else
buf = kmalloc(size, gfp);
- *buf = size;
+ buf->len = size;
dprintk("RPC: %5u allocated buffer of size %zu at %p\n",
task->tk_pid, size, buf);
- return ++buf;
+ return &buf->data;
}
/**
@@ -775,15 +780,18 @@ void *rpc_malloc(struct rpc_task *task, size_t size)
*/
void rpc_free(void *buffer)
{
- size_t size, *buf = buffer;
+ size_t size;
+ struct rpc_buffer *buf;
if (!buffer)
return;
- size = *buf;
- buf--;
+
+ buf = container_of(buffer, struct rpc_buffer, data);
+ size = buf->len;
dprintk("RPC: freeing buffer of size %zu at %p\n",
size, buf);
+
if (size <= RPC_BUFFER_MAXSIZE)
mempool_free(buf, rpc_buffer_mempool);
else