param: lock if_sdio's lbs_helper_name and lbs_fw_name against sysfs changes.
Since it can be changed via sysfs, we need to make a copy. This most
generic way of doing this is to keep a flag so we know when to free it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Cc: Dan Williams <dcbw@redhat.com>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: libertas-dev@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
index 6e71346..ba854c7 100644
--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -125,6 +125,8 @@
const char *helper;
const char *firmware;
+ bool helper_allocated;
+ bool firmware_allocated;
u8 buffer[65536];
@@ -984,16 +986,34 @@
card->helper = if_sdio_models[i].helper;
card->firmware = if_sdio_models[i].firmware;
+ kparam_block_sysfs_write(helper_name);
if (lbs_helper_name) {
+ char *helper = kstrdup(lbs_helper_name, GFP_KERNEL);
+ if (!helper) {
+ kparam_unblock_sysfs_write(helper_name);
+ ret = -ENOMEM;
+ goto free;
+ }
lbs_deb_sdio("overriding helper firmware: %s\n",
lbs_helper_name);
- card->helper = lbs_helper_name;
+ card->helper = helper;
+ card->helper_allocated = true;
}
+ kparam_unblock_sysfs_write(helper_name);
+ kparam_block_sysfs_write(fw_name);
if (lbs_fw_name) {
+ char *fw_name = kstrdup(lbs_fw_name, GFP_KERNEL);
+ if (!fw_name) {
+ kparam_unblock_sysfs_write(fw_name);
+ ret = -ENOMEM;
+ goto free;
+ }
lbs_deb_sdio("overriding firmware: %s\n", lbs_fw_name);
- card->firmware = lbs_fw_name;
+ card->firmware = fw_name;
+ card->firmware_allocated = true;
}
+ kparam_unblock_sysfs_write(fw_name);
sdio_claim_host(func);
@@ -1127,6 +1147,10 @@
kfree(packet);
}
+ if (card->helper_allocated)
+ kfree(card->helper);
+ if (card->firmware_allocated)
+ kfree(card->firmware);
kfree(card);
goto out;
@@ -1177,6 +1201,10 @@
kfree(packet);
}
+ if (card->helper_allocated)
+ kfree(card->helper);
+ if (card->firmware_allocated)
+ kfree(card->firmware);
kfree(card);
lbs_deb_leave(LBS_DEB_SDIO);