[Qemu-devel] [PATCH] hw/mcf5206: Fix buffer overflow for MBAR read / write

[Stefan Weil]

Report from smatch:

mcf5206.c:384 m5206_mbar_readb(7) error: buffer overflow 'm5206_mbar_width' 128 
<= 128
mcf5206.c:403 m5206_mbar_readw(8) error: buffer overflow 'm5206_mbar_width' 128 
<= 128
mcf5206.c:427 m5206_mbar_readl(8) error: buffer overflow 'm5206_mbar_width' 128 
<= 128
mcf5206.c:451 m5206_mbar_writeb(9) error: buffer overflow 'm5206_mbar_width' 
128 <= 128
mcf5206.c:475 m5206_mbar_writew(9) error: buffer overflow 'm5206_mbar_width' 
128 <= 128
mcf5206.c:503 m5206_mbar_writel(9) error: buffer overflow 'm5206_mbar_width' 
128 <= 128

m5206_mbar_width has 0x80 elements and supports 0 <= offset < 0x200.

Signed-off-by: Stefan Weil <s...@weilnetz.de>
---
 hw/mcf5206.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/hw/mcf5206.c b/hw/mcf5206.c
index 539b391..27753e2 100644
--- a/hw/mcf5206.c
+++ b/hw/mcf5206.c
@@ -378,7 +378,7 @@ static uint32_t m5206_mbar_readb(void *opaque, 
target_phys_addr_t offset)
 {
     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
     offset &= 0x3ff;
-    if (offset > 0x200) {
+    if (offset >= 0x200) {
         hw_error("Bad MBAR read offset 0x%x", (int)offset);
     }
     if (m5206_mbar_width[offset >> 2] > 1) {
@@ -397,7 +397,7 @@ static uint32_t m5206_mbar_readw(void *opaque, 
target_phys_addr_t offset)
     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
     int width;
     offset &= 0x3ff;
-    if (offset > 0x200) {
+    if (offset >= 0x200) {
         hw_error("Bad MBAR read offset 0x%x", (int)offset);
     }
     width = m5206_mbar_width[offset >> 2];
@@ -421,7 +421,7 @@ static uint32_t m5206_mbar_readl(void *opaque, 
target_phys_addr_t offset)
     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
     int width;
     offset &= 0x3ff;
-    if (offset > 0x200) {
+    if (offset >= 0x200) {
         hw_error("Bad MBAR read offset 0x%x", (int)offset);
     }
     width = m5206_mbar_width[offset >> 2];
@@ -445,7 +445,7 @@ static void m5206_mbar_writeb(void *opaque, 
target_phys_addr_t offset,
     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
     int width;
     offset &= 0x3ff;
-    if (offset > 0x200) {
+    if (offset >= 0x200) {
         hw_error("Bad MBAR write offset 0x%x", (int)offset);
     }
     width = m5206_mbar_width[offset >> 2];
@@ -469,7 +469,7 @@ static void m5206_mbar_writew(void *opaque, 
target_phys_addr_t offset,
     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
     int width;
     offset &= 0x3ff;
-    if (offset > 0x200) {
+    if (offset >= 0x200) {
         hw_error("Bad MBAR write offset 0x%x", (int)offset);
     }
     width = m5206_mbar_width[offset >> 2];
@@ -497,7 +497,7 @@ static void m5206_mbar_writel(void *opaque, 
target_phys_addr_t offset,
     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
     int width;
     offset &= 0x3ff;
-    if (offset > 0x200) {
+    if (offset >= 0x200) {
         hw_error("Bad MBAR write offset 0x%x", (int)offset);
     }
     width = m5206_mbar_width[offset >> 2];
-- 
1.7.10