Author: Mario Haustein <mario.haustein@hrz.tu-chemnitz.de>
Date:   Mon Aug 22 18:52:19 2022 +0200

    PPC: fix out of bound memory access
    
    closes #1912

Bug: https://bugs.gentoo.org/865151
Upstream: https://github.com/capstone-engine/capstone/pull/1913

diff --git a/arch/PowerPC/PPCInstPrinter.c b/arch/PowerPC/PPCInstPrinter.c
index 22eef4ee..a5a30a8b 100644
--- a/arch/PowerPC/PPCInstPrinter.c
+++ b/arch/PowerPC/PPCInstPrinter.c
@@ -1116,7 +1116,8 @@ static char *stripRegisterPrefix(const char *RegName)
 				char *name = cs_strdup(RegName + 2);
 
 				// also strip the last 2 letters
-				name[strlen(name) - 2] = '\0';
+				if(strlen(name) > 2)
+					name[strlen(name) - 2] = '\0';
 
 				return name;
 			}
diff --git a/suite/cstest/issues.cs b/suite/cstest/issues.cs
index e4fb6cfa..3183f43f 100644
--- a/suite/cstest/issues.cs
+++ b/suite/cstest/issues.cs
@@ -1,3 +1,11 @@
+!# issue 1912 PPC register name
+!# CS_ARCH_PPC, CS_MODE_BIG_ENDIAN, None
+0x2d,0x03,0x00,0x80 == cmpwi cr2, r3, 0x80
+
+!# issue 1912 PPC no register name
+!# CS_ARCH_PPC, CS_MODE_BIG_ENDIAN, CS_OPT_SYNTAX_NOREGNAME
+0x2d,0x03,0x00,0x80 == cmpwi 2, 3, 0x80
+
 !# issue 1839 AArch64 Incorrect detailed disassembly of ldr
 !# CS_ARCH_ARM64, CS_MODE_ARM, CS_OPT_DETAIL
 0x41,0x00,0x40,0xf9 == ldr x1, [x2] ; operands[0].access: WRITE ; operands[1].access: READ