flex_array: introduce DEFINE_FLEX_ARRAY

FLEX_ARRAY_INIT(element_size, total_nr_elements) cannot determine if
either parameter is valid, so flex arrays which are statically allocated
with this interface can easily become corrupted or reference beyond its
allocated memory.

This removes FLEX_ARRAY_INIT() as a struct flex_array initializer since no
initializer may perform the required checking.  Instead, the array is now
defined with a new interface:

	DEFINE_FLEX_ARRAY(name, element_size, total_nr_elements)

This may be prefixed with `static' for file scope.

This interface includes compile-time checking of the parameters to ensure
they are valid.  Since the validity of both element_size and
total_nr_elements depend on FLEX_ARRAY_BASE_SIZE and FLEX_ARRAY_PART_SIZE,
the kernel build will fail if either of these predefined values changes
such that the array parameters are no longer valid.

Since BUILD_BUG_ON() requires compile time constants, several of the
static inline functions that were once local to lib/flex_array.c had to be
moved to include/linux/flex_array.h.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 36 insertions, 30 deletions

diff --git a/include/linux/flex_array.h b/include/linux/flex_array.h
index f12401e485fe..1d747f72298b 100644
--- a/include/linux/flex_array.h
+++ b/include/linux/flex_array.h
@@ -31,10 +31,32 @@ struct flex_array {
         };
 };
 
-#define FLEX_ARRAY_INIT(size, total) { { {\
-        .element_size = (size),         \
-        .total_nr_elements = (total),   \
-} } }
+/* Number of bytes left in base struct flex_array, excluding metadata */
+#define FLEX_ARRAY_BASE_BYTES_LEFT                                      \
+        (FLEX_ARRAY_BASE_SIZE - offsetof(struct flex_array, parts))
+
+/* Number of pointers in base to struct flex_array_part pages */
+#define FLEX_ARRAY_NR_BASE_PTRS                                         \
+        (FLEX_ARRAY_BASE_BYTES_LEFT / sizeof(struct flex_array_part *))
+
+/* Number of elements of size that fit in struct flex_array_part */
+#define FLEX_ARRAY_ELEMENTS_PER_PART(size)                              \
+        (FLEX_ARRAY_PART_SIZE / size)
+
+/*
+ * Defines a statically allocated flex array and ensures its parameters are
+ * valid.
+ */
+#define DEFINE_FLEX_ARRAY(__arrayname, __element_size, __total)         \
+        struct flex_array __arrayname = { { {                           \
+                .element_size = (__element_size),                       \
+                .total_nr_elements = (__total),                         \
+        } } };                                                          \
+        static inline void __arrayname##_invalid_parameter(void)        \
+        {                                                               \
+                BUILD_BUG_ON((__total) > FLEX_ARRAY_NR_BASE_PTRS *      \
+                        FLEX_ARRAY_ELEMENTS_PER_PART(__element_size));  \
+        }
 
 struct flex_array *flex_array_alloc(int element_size, unsigned int total,
                 gfp_t flags);
diff --git a/lib/flex_array.c b/lib/flex_array.c
index 1b03bb553410..b62ce6cffd0a 100644
--- a/lib/flex_array.c
+++ b/lib/flex_array.c
@@ -28,23 +28,6 @@ struct flex_array_part {
         char elements[FLEX_ARRAY_PART_SIZE];
 };
 
-static inline int __elements_per_part(int element_size)
-{
-        return FLEX_ARRAY_PART_SIZE / element_size;
-}
-
-static inline int bytes_left_in_base(void)
-{
-        int element_offset = offsetof(struct flex_array, parts);
-        int bytes_left = FLEX_ARRAY_BASE_SIZE - element_offset;
-        return bytes_left;
-}
-
-static inline int nr_base_part_ptrs(void)
-{
-        return bytes_left_in_base() / sizeof(struct flex_array_part *);
-}
-
 /*
  * If a user requests an allocation which is small
  * enough, we may simply use the space in the
@@ -54,7 +37,7 @@ static inline int nr_base_part_ptrs(void)
 static inline int elements_fit_in_base(struct flex_array *fa)
 {
         int data_size = fa->element_size * fa->total_nr_elements;
-        if (data_size <= bytes_left_in_base())
+        if (data_size <= FLEX_ARRAY_BASE_BYTES_LEFT)
                 return 1;
         return 0;
 }
@@ -103,7 +86,8 @@ struct flex_array *flex_array_alloc(int element_size, unsigned int total,
                                         gfp_t flags)
 {
         struct flex_array *ret;
-        int max_size = nr_base_part_ptrs() * __elements_per_part(element_size);
+        int max_size = FLEX_ARRAY_NR_BASE_PTRS *
+                                FLEX_ARRAY_ELEMENTS_PER_PART(element_size);
 
         /* max_size will end up 0 if element_size > PAGE_SIZE */
         if (total > max_size)
@@ -114,14 +98,15 @@ struct flex_array *flex_array_alloc(int element_size, unsigned int total,
         ret->element_size = element_size;
         ret->total_nr_elements = total;
         if (elements_fit_in_base(ret) && !(flags & __GFP_ZERO))
-                memset(ret->parts[0], FLEX_ARRAY_FREE, bytes_left_in_base());
+                memset(ret->parts[0], FLEX_ARRAY_FREE,
+                                                FLEX_ARRAY_BASE_BYTES_LEFT);
         return ret;
 }
 
 static int fa_element_to_part_nr(struct flex_array *fa,
                                         unsigned int element_nr)
 {
-        return element_nr / __elements_per_part(fa->element_size);
+        return element_nr / FLEX_ARRAY_ELEMENTS_PER_PART(fa->element_size);
 }
 
 /**
@@ -133,11 +118,10 @@ static int fa_element_to_part_nr(struct flex_array *fa,
 void flex_array_free_parts(struct flex_array *fa)
 {
         int part_nr;
-        int max_part = nr_base_part_ptrs();
 
         if (elements_fit_in_base(fa))
                 return;
-        for (part_nr = 0; part_nr < max_part; part_nr++)
+        for (part_nr = 0; part_nr < FLEX_ARRAY_NR_BASE_PTRS; part_nr++)
                 kfree(fa->parts[part_nr]);
 }
 
@@ -152,7 +136,8 @@ static unsigned int index_inside_part(struct flex_array *fa,
 {
         unsigned int part_offset;
 
-        part_offset = element_nr % __elements_per_part(fa->element_size);
+        part_offset = element_nr %
+                                FLEX_ARRAY_ELEMENTS_PER_PART(fa->element_size);
         return part_offset * fa->element_size;
 }
 
@@ -313,13 +298,12 @@ static int part_is_free(struct flex_array_part *part)
 int flex_array_shrink(struct flex_array *fa)
 {
         struct flex_array_part *part;
-        int max_part = nr_base_part_ptrs();
         int part_nr;
         int ret = 0;
 
         if (elements_fit_in_base(fa))
                 return ret;
-        for (part_nr = 0; part_nr < max_part; part_nr++) {
+        for (part_nr = 0; part_nr < FLEX_ARRAY_NR_BASE_PTRS; part_nr++) {
                 part = fa->parts[part_nr];
                 if (!part)
                         continue;