[PATCH] tools/libs/light: correct bitmap operations

* [PATCH] tools/libs/light: correct bitmap operations
@ 2020-11-06 14:05 Juergen Gross
  2020-11-06 14:35 ` Jan Beulich
  2020-11-06 15:57 ` Wei Liu
  0 siblings, 2 replies; 6+ messages in thread
From: Juergen Gross @ 2020-11-06 14:05 UTC (permalink / raw)
  To: xen-devel; +Cc: Juergen Gross, Ian Jackson, Wei Liu, Anthony PERARD

Libxl bitmap operations for single bits (test, set, reset) take the bit
number as a signed integer without testing the value to be larger than
0.

Correct that by adding the appropriate tests.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 tools/libs/light/libxl_utils.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/libs/light/libxl_utils.c b/tools/libs/light/libxl_utils.c
index b039143b8a..4699c4a0a3 100644
--- a/tools/libs/light/libxl_utils.c
+++ b/tools/libs/light/libxl_utils.c
@@ -688,21 +688,21 @@ int libxl_bitmap_is_empty(const libxl_bitmap *bitmap)
 
 int libxl_bitmap_test(const libxl_bitmap *bitmap, int bit)
 {
-    if (bit >= bitmap->size * 8)
+    if (bit >= bitmap->size * 8 || bit < 0)
         return 0;
     return (bitmap->map[bit / 8] & (1 << (bit & 7))) ? 1 : 0;
 }
 
 void libxl_bitmap_set(libxl_bitmap *bitmap, int bit)
 {
-    if (bit >= bitmap->size * 8)
+    if (bit >= bitmap->size * 8 || bit < 0)
         return;
     bitmap->map[bit / 8] |= 1 << (bit & 7);
 }
 
 void libxl_bitmap_reset(libxl_bitmap *bitmap, int bit)
 {
-    if (bit >= bitmap->size * 8)
+    if (bit >= bitmap->size * 8 || bit < 0)
         return;
     bitmap->map[bit / 8] &= ~(1 << (bit & 7));
 }
-- 
2.26.2



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