x86: Handle failures of parsing immediate operands in the instruction decoder

This can happen if the instruction is much longer than the maximum length,
or if insn->opnd_bytes is manually changed.

This patch also fixes warnings from -Wswitch-default flag.

Reported-by: Prashanth Nageshappa <prashanth@linux.vnet.ibm.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Linux-mm <linux-mm@kvack.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Anton Arapov <anton@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: yrl.pp-manager.tt@hitachi.com
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120413032427.32577.42602.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c
index 25feb1ae71c5758273346057d8809232bdb1c769..b1e6c4b2e8eb228834edcbad9d9ff8ffbb9d99f9 100644 (file)
--- a/arch/x86/lib/insn.c
+++ b/arch/x86/lib/insn.c
@@ -379,8 +379,8 @@ err_out:
        return;
 }
 
-/* Decode moffset16/32/64 */
-static void __get_moffset(struct insn *insn)
+/* Decode moffset16/32/64. Return 0 if failed */
+static int __get_moffset(struct insn *insn)
 {
        switch (insn->addr_bytes) {
        case 2:
@@ -397,15 +397,19 @@ static void __get_moffset(struct insn *insn)
                insn->moffset2.value = get_next(int, insn);
                insn->moffset2.nbytes = 4;
                break;
+       default:        /* opnd_bytes must be modified manually */
+               goto err_out;
        }
        insn->moffset1.got = insn->moffset2.got = 1;
 
+       return 1;
+
 err_out:
-       return;
+       return 0;
 }
 
-/* Decode imm v32(Iz) */
-static void __get_immv32(struct insn *insn)
+/* Decode imm v32(Iz). Return 0 if failed */
+static int __get_immv32(struct insn *insn)
 {
        switch (insn->opnd_bytes) {
        case 2:
@@ -417,14 +421,18 @@ static void __get_immv32(struct insn *insn)
                insn->immediate.value = get_next(int, insn);
                insn->immediate.nbytes = 4;
                break;
+       default:        /* opnd_bytes must be modified manually */
+               goto err_out;
        }
 
+       return 1;
+
 err_out:
-       return;
+       return 0;
 }
 
-/* Decode imm v64(Iv/Ov) */
-static void __get_immv(struct insn *insn)
+/* Decode imm v64(Iv/Ov), Return 0 if failed */
+static int __get_immv(struct insn *insn)
 {
        switch (insn->opnd_bytes) {
        case 2:
@@ -441,15 +449,18 @@ static void __get_immv(struct insn *insn)
                insn->immediate2.value = get_next(int, insn);
                insn->immediate2.nbytes = 4;
                break;
+       default:        /* opnd_bytes must be modified manually */
+               goto err_out;
        }
        insn->immediate1.got = insn->immediate2.got = 1;
 
+       return 1;
 err_out:
-       return;
+       return 0;
 }
 
 /* Decode ptr16:16/32(Ap) */
-static void __get_immptr(struct insn *insn)
+static int __get_immptr(struct insn *insn)
 {
        switch (insn->opnd_bytes) {
        case 2:
@@ -462,14 +473,17 @@ static void __get_immptr(struct insn *insn)
                break;
        case 8:
                /* ptr16:64 is not exist (no segment) */
-               return;
+               return 0;
+       default:        /* opnd_bytes must be modified manually */
+               goto err_out;
        }
        insn->immediate2.value = get_next(unsigned short, insn);
        insn->immediate2.nbytes = 2;
        insn->immediate1.got = insn->immediate2.got = 1;
 
+       return 1;
 err_out:
-       return;
+       return 0;
 }
 
 /**
@@ -489,7 +503,8 @@ void insn_get_immediate(struct insn *insn)
                insn_get_displacement(insn);
 
        if (inat_has_moffset(insn->attr)) {
-               __get_moffset(insn);
+               if (!__get_moffset(insn))
+                       goto err_out;
                goto done;
        }
 
@@ -517,16 +532,20 @@ void insn_get_immediate(struct insn *insn)
                insn->immediate2.nbytes = 4;
                break;
        case INAT_IMM_PTR:
-               __get_immptr(insn);
+               if (!__get_immptr(insn))
+                       goto err_out;
                break;
        case INAT_IMM_VWORD32:
-               __get_immv32(insn);
+               if (!__get_immv32(insn))
+                       goto err_out;
                break;
        case INAT_IMM_VWORD:
-               __get_immv(insn);
+               if (!__get_immv(insn))
+                       goto err_out;
                break;
        default:
-               break;
+               /* Here, insn must have an immediate, but failed */
+               goto err_out;
        }
        if (inat_has_second_immediate(insn->attr)) {
                insn->immediate2.value = get_next(char, insn);