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[Qemu-devel] [PATCH for-2.9 5/6] disas/cris: Avoid unintended sign exten
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH for-2.9 5/6] disas/cris: Avoid unintended sign extension |
Date: |
Fri, 3 Mar 2017 15:50:32 +0000 |
In the cris disassembler we were using 'unsigned long' to calculate
addresses which are supposed to be 32 bits. This meant that we might
accidentally sign extend or calculate a value that was outside the 32
bit range of the guest CPU. Use 'uint32_t' instead so we give the
right answers on 64-bit hosts.
(Spotted by Coverity, CID 1005402, 1005403.)
Signed-off-by: Peter Maydell <address@hidden>
---
disas/cris.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/disas/cris.c b/disas/cris.c
index 8a1daf9..30217f1 100644
--- a/disas/cris.c
+++ b/disas/cris.c
@@ -2009,7 +2009,7 @@ print_with_operands (const struct cris_opcode *opcodep,
case 'n':
{
/* Like N but pc-relative to the start of the insn. */
- unsigned long number
+ uint32_t number
= (buffer[2] + buffer[3] * 256 + buffer[4] * 65536
+ buffer[5] * 0x1000000 + addr);
@@ -2201,7 +2201,7 @@ print_with_operands (const struct cris_opcode *opcodep,
{
/* It's [pc+]. This cannot possibly be anything
but an address. */
- unsigned long number
+ uint32_t number
= prefix_buffer[2] + prefix_buffer[3] * 256
+ prefix_buffer[4] * 65536
+ prefix_buffer[5] * 0x1000000;
--
2.7.4
- [Qemu-devel] [PATCH for-2.9 3/6] disas/m68k: Avoid unintended sign extension in get_field(), (continued)
- [Qemu-devel] [PATCH for-2.9 2/6] disas/i386: Avoid NULL pointer dereference in error case, Peter Maydell, 2017/03/03
- [Qemu-devel] [PATCH for-2.9 1/6] disas/hppa: Remove dead code, Peter Maydell, 2017/03/03
- [Qemu-devel] [PATCH for-2.9 5/6] disas/cris: Avoid unintended sign extension,
Peter Maydell <=
- Re: [Qemu-devel] [PATCH for-2.9 0/6] disas: Fix various coverity nits, no-reply, 2017/03/03
- Re: [Qemu-devel] [PATCH for-2.9 0/6] disas: Fix various coverity nits, no-reply, 2017/03/03
- Re: [Qemu-devel] [PATCH for-2.9 0/6] disas: Fix various coverity nits, Peter Maydell, 2017/03/07