From 886275ce41a9751117367fb387ed171049eb6148 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Wed, 11 Aug 2010 23:04:33 -0600 Subject: [PATCH] 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 Reviewed-by: Takashi Iwai Cc: Dan Williams Cc: John W. Linville Cc: libertas-dev@lists.infradead.org Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org --- drivers/net/wireless/libertas/if_sdio.c | 32 +++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c index 6e71346a7550..ba854c70ab94 100644 --- a/drivers/net/wireless/libertas/if_sdio.c +++ b/drivers/net/wireless/libertas/if_sdio.c @@ -125,6 +125,8 @@ struct if_sdio_card { const char *helper; const char *firmware; + bool helper_allocated; + bool firmware_allocated; u8 buffer[65536]; @@ -984,16 +986,34 @@ static int if_sdio_probe(struct sdio_func *func, 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 @@ free: kfree(packet); } + if (card->helper_allocated) + kfree(card->helper); + if (card->firmware_allocated) + kfree(card->firmware); kfree(card); goto out; @@ -1177,6 +1201,10 @@ static void if_sdio_remove(struct sdio_func *func) kfree(packet); } + if (card->helper_allocated) + kfree(card->helper); + if (card->firmware_allocated) + kfree(card->firmware); kfree(card); lbs_deb_leave(LBS_DEB_SDIO); -- 2.39.2