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x86/insn-eval: Handle insn_get_opcode() failure

Browse source 
is_string_insn() calls insn_get_opcode() that can fail, but does not
handle the failure.

is_string_insn() interface does not allow to communicate an error to the
caller.

Push insn_get_opcode() to the only non-static user of is_string_insn()
and fail it early if insn_get_opcode() fails.

[ dhansen: fix tabs-versus-spaces breakage ]

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lkml.kernel.org/r/20211130184933.31005-2-kirill.shutemov@linux.intel.com
This commit is contained in:
Kirill A. Shutemov 2021-11-30 21:49:30 +03:00 committed by Dave Hansen
parent d58071a8a7
commit 23ef731e43
1 changed files with 3 additions and 2 deletions
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5
arch/x86/lib/insn-eval.c
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@ -37,8 +37,6 @@ enum reg_type {
*/
static bool is_string_insn(struct insn *insn)
{
insn_get_opcode(insn);
/* All string instructions have a 1-byte opcode. */
if (insn->opcode.nbytes != 1)
return false;
@ -1405,6 +1403,9 @@ void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs)
if (!insn || !regs)
return (void __user *)-1L;
if (insn_get_opcode(insn))
return (void __user *)-1L;
switch (insn->addr_bytes) {
case 2:
return get_addr_ref_16(insn, regs);