wl1251: fix crash on remove due to premature kfree

Currently SDIO glue frees it's own structure before calling
wl1251_free_hw(), which in turn calls ieee80211_unregister_hw().
The later call may result in a need to communicate with the chip
to stop it (as it happens now if the interface is still up before
rmmod), which means calls are made back to the glue, resulting in
freed memory access.

Fix this by freeing glue data last.

Cc: stable@vger.kernel.org # v2.6.37+
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/wl1251/sdio.c b/drivers/net/wireless/wl1251/sdio.c
index f78694295c397f053f4a00115ff2aff22d8a4379..1b851f650e074eb795ffb708dd25b3c94a2cb9e1 100644 (file)
--- a/drivers/net/wireless/wl1251/sdio.c
+++ b/drivers/net/wireless/wl1251/sdio.c
@@ -315,8 +315,8 @@ static void __devexit wl1251_sdio_remove(struct sdio_func *func)
 
        if (wl->irq)
                free_irq(wl->irq, wl);
-       kfree(wl_sdio);
        wl1251_free_hw(wl);
+       kfree(wl_sdio);
 
        sdio_claim_host(func);
        sdio_release_irq(func);