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[PULL,18/31] lm32: milkymist-tmu2: fix another integer overflow

Message ID d4628acb08ae6852c23605736d61649df6ef20d2.1485250702.git.mjt@msgid.tls.msk.ru
State Accepted
Commit 4382fa6554987d8c10cdd0fafb04191a40c9743e
Headers show
Series None | expand

Commit Message

Michael Tokarev Jan. 24, 2017, 9:39 a.m. UTC 
From: Peter Maydell <peter.maydell@linaro.org>


Don't truncate the multiplication and do a 64 bit one instead
because the result is stored in a 64 bit variable.

This fixes a similar coverity warning to commit 237a8650d640,
in a similar way, and is the other half of the fix for
coverity CID 1167561.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Acked-by: Michael Walle <michael@walle.cc>

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

---
 hw/display/milkymist-tmu2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.1.4
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Patch

diff --git a/hw/display/milkymist-tmu2.c b/hw/display/milkymist-tmu2.c
index 5c666f9..920374b 100644
--- a/hw/display/milkymist-tmu2.c
+++ b/hw/display/milkymist-tmu2.c
@@ -257,7 +257,7 @@  static void tmu2_start(MilkymistTMU2State *s)
     glColor4f(m, m, m, (float)(s->regs[R_ALPHA] + 1) / 64.0f);
 
     /* Read the QEMU dest. framebuffer into the OpenGL framebuffer */
-    fb_len = 2 * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
+    fb_len = 2ULL * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
     fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 0);
     if (fb == NULL) {
         glDeleteTextures(1, &texture);