3 files changed, 22 insertions, 10 deletions

diff --git a/lib/flex_array.c b/lib/flex_array.c
index c0ea40ba2082..854b57bd7d9d 100644
--- a/lib/flex_array.c
+++ b/lib/flex_array.c
@@ -232,10 +232,10 @@ EXPORT_SYMBOL(flex_array_clear);
 
 /**
  * flex_array_prealloc - guarantee that array space exists
- * @fa:         the flex array for which to preallocate parts
- * @start:      index of first array element for which space is allocated
- * @end:        index of last (inclusive) element for which space is allocated
- * @flags:      page allocation flags
+ * @fa:                 the flex array for which to preallocate parts
+ * @start:              index of first array element for which space is allocated
+ * @nr_elements:        number of elements for which space is allocated
+ * @flags:              page allocation flags
  *
  * This will guarantee that no future calls to flex_array_put()
  * will allocate memory.  It can be used if you are expecting to
@@ -245,14 +245,24 @@ EXPORT_SYMBOL(flex_array_clear);
  * Locking must be provided by the caller.
  */
 int flex_array_prealloc(struct flex_array *fa, unsigned int start,
-                        unsigned int end, gfp_t flags)
+                        unsigned int nr_elements, gfp_t flags)
 {
         int start_part;
         int end_part;
         int part_nr;
+        unsigned int end;
         struct flex_array_part *part;
 
-        if (start >= fa->total_nr_elements || end >= fa->total_nr_elements)
+        if (!start && !nr_elements)
+                return 0;
+        if (start >= fa->total_nr_elements)
+                return -ENOSPC;
+        if (!nr_elements)
+                return 0;
+
+        end = start + nr_elements - 1;
+
+        if (end >= fa->total_nr_elements)
                 return -ENOSPC;
         if (elements_fit_in_base(fa))
                 return 0;
@@ -343,6 +353,8 @@ int flex_array_shrink(struct flex_array *fa)
         int part_nr;
         int ret = 0;
 
+        if (!fa->total_nr_elements)
+                return 0;
         if (elements_fit_in_base(fa))
                 return ret;
         for (part_nr = 0; part_nr < FLEX_ARRAY_NR_BASE_PTRS; part_nr++) {
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index bc0ac6b333dc..dfd60192bc2e 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -797,7 +797,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
         return string(buf, end, uuid, spec);
 }
 
-int kptr_restrict = 1;
+int kptr_restrict __read_mostly;
 
 /*
  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
diff --git a/lib/xz/xz_dec_lzma2.c b/lib/xz/xz_dec_lzma2.c
index ea5fa4fe9d67..a6cdc969ea42 100644
--- a/lib/xz/xz_dec_lzma2.c
+++ b/lib/xz/xz_dec_lzma2.c
@@ -969,6 +969,9 @@ XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s,
                          */
                         tmp = b->in[b->in_pos++];
 
+                        if (tmp == 0x00)
+                                return XZ_STREAM_END;
+
                         if (tmp >= 0xE0 || tmp == 0x01) {
                                 s->lzma2.need_props = true;
                                 s->lzma2.need_dict_reset = false;
@@ -1001,9 +1004,6 @@ XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s,
                                                 lzma_reset(s);
                                 }
                         } else {
-                                if (tmp == 0x00)
-                                        return XZ_STREAM_END;
-
                                 if (tmp > 0x02)
                                         return XZ_DATA_ERROR;