[Qemu-devel] [PATCH 02/18] TCG: fix negative frame offset calculations

[Blue Swirl <blauwirbel@gmail.com>]

size_t is unsigned, so the frame offset calculations can be incorrect for
negative offsets.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
---
 tcg/tcg.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/tcg/tcg.c b/tcg/tcg.c
index fad92f9..b31d80d 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1440,13 +1440,17 @@ static void temp_allocate_frame(TCGContext *s, int temp)
 {
     TCGTemp *ts;
     ts = &s->temps[temp];
-    s->current_frame_offset = (s->current_frame_offset +
sizeof(tcg_target_long) - 1) & ~(sizeof(tcg_target_long) - 1);
-    if (s->current_frame_offset + sizeof(tcg_target_long) > s->frame_end)
+    s->current_frame_offset = (s->current_frame_offset +
+                               (tcg_target_long)sizeof(tcg_target_long) - 1) &
+        ~(sizeof(tcg_target_long) - 1);
+    if (s->current_frame_offset + (tcg_target_long)sizeof(tcg_target_long) >
+        s->frame_end) {
         tcg_abort();
+    }
     ts->mem_offset = s->current_frame_offset;
     ts->mem_reg = s->frame_reg;
     ts->mem_allocated = 1;
-    s->current_frame_offset += sizeof(tcg_target_long);
+    s->current_frame_offset += (tcg_target_long)sizeof(tcg_target_long);
 }

 /* free register 'reg' by spilling the corresponding temporary if necessary */
-- 
1.6.2.4