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authorRusty Russell <rusty@rustcorp.com.au>2010-08-11 23:04:33 -0600
committerRusty Russell <rusty@rustcorp.com.au>2010-08-11 23:04:37 +0930
commit886275ce41a9751117367fb387ed171049eb6148 (patch)
tree0e712d9902ab3c2c23dffb1c3565369fac72d2fa /drivers/net
parent7d3510356b066bcfa9898ec3f90c9c7810ba6ed7 (diff)
downloadop-kernel-dev-886275ce41a9751117367fb387ed171049eb6148.zip
op-kernel-dev-886275ce41a9751117367fb387ed171049eb6148.tar.gz
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
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/libertas/if_sdio.c32
1 files changed, 30 insertions, 2 deletions
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 @@ 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);
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