[PATCH 3/5] staging: wilc1000: replace MALLOC_WILC_BUFFER() macro to avoid possible memory leak

[Raphaël Beamonte]

The MACRO_WILC_BUFFER() macro was using a return statement, and didn't
take care of possible memory leaks and subsequent bugs when it was failing
after succeeding some allocations. This patch corrects this behavior.

Signed-off-by: Raphaël Beamonte <raphael.beamo...@gmail.com>
---
 drivers/staging/wilc1000/wilc_exported_buf.c | 39 +++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/wilc1000/wilc_exported_buf.c 
b/drivers/staging/wilc1000/wilc_exported_buf.c
index bf392fb..c3aff9a 100644
--- a/drivers/staging/wilc1000/wilc_exported_buf.c
+++ b/drivers/staging/wilc1000/wilc_exported_buf.c
@@ -8,13 +8,6 @@
 #define LINUX_TX_SIZE  (64 * 1024)
 #define WILC1000_FW_SIZE (4 * 1024)
 
-#define MALLOC_WILC_BUFFER(name, size) \
-       exported_ ## name = kmalloc(size, GFP_KERNEL);    \
-       if (!exported_ ## name) {   \
-               printk("fail to alloc: %s memory\n", exported_ ## name);  \
-               return -ENOBUFS;        \
-       }
-
 /*
  * Add necessary buffer pointers
  */
@@ -40,17 +33,43 @@ void *get_fw_buffer(void)
 }
 EXPORT_SYMBOL(get_fw_buffer);
 
+static inline int kmalloc_wilc_buffer(void *buf, int size)
+{
+       buf = kmalloc(size, GFP_KERNEL);
+       if (!buf) {
+               printk("fail to alloc memory\n");
+               return -ENOBUFS;
+       }
+       return 0;
+}
+
 static int __init wilc_module_init(void)
 {
        printk("wilc_module_init\n");
        /*
         * alloc necessary memory
         */
-       MALLOC_WILC_BUFFER(g_tx_buf, LINUX_TX_SIZE)
-       MALLOC_WILC_BUFFER(g_rx_buf, LINUX_RX_SIZE)
-       MALLOC_WILC_BUFFER(g_fw_buf, WILC1000_FW_SIZE)
+       if (kmalloc_wilc_buffer(exported_g_tx_buf, LINUX_TX_SIZE))
+               goto error_g_tx_buf;
+
+       if (kmalloc_wilc_buffer(exported_g_rx_buf, LINUX_RX_SIZE))
+               goto error_g_rx_buf;
+
+       if (kmalloc_wilc_buffer(exported_g_fw_buf, WILC1000_FW_SIZE))
+               goto error_g_fw_buf;
 
        return 0;
+
+error_g_fw_buf:
+       kfree(exported_g_rx_buf);
+       exported_g_rx_buf = NULL;
+
+error_g_rx_buf:
+       kfree(exported_g_tx_buf);
+       exported_g_tx_buf = NULL;
+
+error_g_tx_buf:
+       return -ENOBUFS;
 }
 
 static void __exit wilc_module_deinit(void)
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/