[PATCH 6/7] lib/bitmap.c: fix remaining space computation in bitmap_print_to_pagebuf

[Rasmus Villemoes]

For various alignments of buf, the current expression computes

4096 ok
4095 ok
8190
8189
...
4097

i.e., if the caller has already written two bytes into the page buffer,
len is 8190 rather than 4094, because PTR_ALIGN aligns up to the next
boundary. So if the printed version of the bitmap is huge, scnprintf()
ends up writing beyond the page boundary.

I don't think any current callers actually write anything before
bitmap_print_to_pagebuf, but the API seems to be designed to allow it.

Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
---
 lib/bitmap.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 1f73b2e52186..277c9a63a5ab 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -460,14 +460,15 @@ EXPORT_SYMBOL(bitmap_parse_user);
  * ranges if list is specified or hex digits grouped into comma-separated
  * sets of 8 digits/set. Returns the number of characters written to buf.
  *
- * It is assumed that @buf is a pointer into a PAGE_SIZE area and that
- * sufficient storage remains at @buf to accommodate the
- * bitmap_print_to_pagebuf() output.
+ * It is assumed that @buf is a pointer into a PAGE_SIZE, page-aligned
+ * area and that sufficient storage remains at @buf to accommodate the
+ * bitmap_print_to_pagebuf() output. Returns the number of characters
+ * actually printed to @buf, excluding terminating '\0'.
  */
 int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
 			    int nmaskbits)
 {
-	ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
+	ptrdiff_t len = PAGE_SIZE - ((unsigned long)buf & (PAGE_SIZE-1));
 	int n = 0;
 
 	if (len > 1)
-- 
2.16.4