From: Daniel Verkamp <daniel@drv.nu>
Date: Tue, 12 Mar 2024 00:56:40 +0000 (-0700)
Subject: vgasrc: round up save/restore size
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=3722c21de19ba64de56495502c0c025b913a9b15;p=seabios.git

vgasrc: round up save/restore size

When calculating the size of the buffer required for the VGA/VBE state,
round up rather than truncating when dividing the number of bytes to get
the number of 64-byte blocks. Without this modification, the save state
function will write past the end of a buffer of the size requested.

Signed-off-by: Daniel Verkamp <daniel@drv.nu>
---

diff --git a/vgasrc/vbe.c b/vgasrc/vbe.c
index 91abc9a..20437db 100644
--- a/vgasrc/vbe.c
+++ b/vgasrc/vbe.c
@@ -244,7 +244,7 @@ vbe_104f04(struct bregs *regs)
     if (ret < 0)
         goto fail;
     if (cmd == 0)
-        regs->bx = ret / 64;
+        regs->bx = DIV_ROUND_UP(ret, 64);
     regs->ax = 0x004f;
     return;
 fail:
diff --git a/vgasrc/vgabios.c b/vgasrc/vgabios.c
index 198ee55..73ba1c3 100644
--- a/vgasrc/vgabios.c
+++ b/vgasrc/vgabios.c
@@ -1081,7 +1081,7 @@ handle_101c(struct bregs *regs)
     if (ret < 0)
         goto fail;
     if (cmd == 0)
-        regs->bx = ret / 64;
+        regs->bx = DIV_ROUND_UP(ret, 64);
     regs->al = 0x1c;
 fail:
     return;