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authorColin Ian King <colin.king@canonical.com>2016-02-26 18:55:31 +0000
committerSasha Levin <sasha.levin@oracle.com>2016-03-09 13:15:11 -0500
commitbb2b7d4ee6fc2c2dea54c12df9c0aea15e1a019c (patch)
parent18d609bb0b8c6823a750b32106be5685ca3daff7 (diff)
x86/mpx: Fix off-by-one comparison with nr_registers
[ Upstream commit 9bf148cb0812595bfdf5100bd2c07e9bec9c6ef5 ] In the unlikely event that regno == nr_registers then we get an array overrun on regoff because the invalid register check is currently off-by-one. Fix this with a check that regno is >= nr_registers instead. Detected with static analysis using CoverityScan. Fixes: fcc7ffd67991 "x86, mpx: Decode MPX instruction to get bound violation information" Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1456512931-3388-1-git-send-email-colin.king@canonical.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index f738c61bc891..6a3c774eaff6 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -142,7 +142,7 @@ static int get_reg_offset(struct insn *insn, struct pt_regs *regs,
- if (regno > nr_registers) {
+ if (regno >= nr_registers) {
WARN_ONCE(1, "decoded an instruction with an invalid register");
return -EINVAL;