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path: root/fs/ecryptfs/crypto.c
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Diffstat (limited to 'fs/ecryptfs/crypto.c')
-rw-r--r--fs/ecryptfs/crypto.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 06db79d05c12..6046239465a1 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1251,6 +1251,7 @@ struct kmem_cache *ecryptfs_header_cache_2;
/**
* ecryptfs_write_headers_virt
* @page_virt: The virtual address to write the headers to
+ * @max: The size of memory allocated at page_virt
* @size: Set to the number of bytes written by this function
* @crypt_stat: The cryptographic context
* @ecryptfs_dentry: The eCryptfs dentry
@@ -1278,7 +1279,8 @@ struct kmem_cache *ecryptfs_header_cache_2;
*
* Returns zero on success
*/
-static int ecryptfs_write_headers_virt(char *page_virt, size_t *size,
+static int ecryptfs_write_headers_virt(char *page_virt, size_t max,
+ size_t *size,
struct ecryptfs_crypt_stat *crypt_stat,
struct dentry *ecryptfs_dentry)
{
@@ -1296,7 +1298,7 @@ static int ecryptfs_write_headers_virt(char *page_virt, size_t *size,
offset += written;
rc = ecryptfs_generate_key_packet_set((page_virt + offset), crypt_stat,
ecryptfs_dentry, &written,
- PAGE_CACHE_SIZE - offset);
+ max - offset);
if (rc)
ecryptfs_printk(KERN_WARNING, "Error generating key packet "
"set; rc = [%d]\n", rc);
@@ -1368,14 +1370,14 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry)
goto out;
}
/* Released in this function */
- virt = kzalloc(crypt_stat->num_header_bytes_at_front, GFP_KERNEL);
+ virt = (char *)get_zeroed_page(GFP_KERNEL);
if (!virt) {
printk(KERN_ERR "%s: Out of memory\n", __func__);
rc = -ENOMEM;
goto out;
}
- rc = ecryptfs_write_headers_virt(virt, &size, crypt_stat,
- ecryptfs_dentry);
+ rc = ecryptfs_write_headers_virt(virt, PAGE_CACHE_SIZE, &size,
+ crypt_stat, ecryptfs_dentry);
if (unlikely(rc)) {
printk(KERN_ERR "%s: Error whilst writing headers; rc = [%d]\n",
__func__, rc);
@@ -1393,8 +1395,7 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry)
goto out_free;
}
out_free:
- memset(virt, 0, crypt_stat->num_header_bytes_at_front);
- kfree(virt);
+ free_page((unsigned long)virt);
out:
return rc;
}