Re: [PATCH 2/4] Add MMC Password Protection (lock/unlock) support V8: mmc_key_retention.diff

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Quoting Anderson Briglia <[email protected]>:
[...]
Hi,
thats really cool stuff you're providing with your patches. :)
I have some feedback or questions some parts here.
But as i just started trying to get into kernelhacking you probably
better don't take my notes to serious, please.

Index: linux-linus-2.6/drivers/mmc/mmc_sysfs.c
===================================================================
--- linux-linus-2.6.orig/drivers/mmc/mmc_sysfs.c        2006-12-04 [...]
+static int mmc_key_instantiate(struct key *key, const void *data, size_t datalen)
+{
+        struct mmc_key_payload *mpayload, *zap;
+        int ret;
+
+        zap = NULL;
What is zap here for? future use?
And wouldn't it be good to also initialize mplayload here?

+        ret = -EINVAL;
Is there a special reason why you already assign the errors to the
return value variable before its clear that the assignment is needed?


+        if (datalen <= 0 || datalen > MMC_KEYLEN_MAXBYTES || !data) {
Isn't the last "|| !data" redundant as you already tested if datalen ==0?

+                pr_debug("Invalid data\n");
+                goto error;
+        }
+
+        ret = key_payload_reserve(key, datalen);
+        if (ret < 0) {
+                pr_debug("ret = %d\n", ret);
+                goto error;
+        }
+
+        ret = -ENOMEM;
Same as above: Why do you in any case want to assign it here?

+        mpayload = kmalloc(sizeof(*mpayload) + datalen, GFP_KERNEL);
I may be totally wrong, but is dereferencing a not initialized pointer
(even just for using sizeof) really ok? Wouldn't it be safer to use
a sizeof(struct mmc_key_payload) here?

Thanks,
Frank


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