4.9-stable review patch. If anyone has any objections, please let me know.
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From: Dmitry V. Levin ldv@altlinux.org
commit c50cbd85cd7027d32ac5945bb60217936b4f7eaf upstream.
When checking for TIF_32BIT_REGS flag, mips_get_syscall_arg() should use the task specified as its argument instead of the current task.
This potentially affects all syscall_get_arguments() users who specify tasks different from the current.
Fixes: c0ff3c53d4f99 ("MIPS: Enable HAVE_ARCH_TRACEHOOK.") Signed-off-by: Dmitry V. Levin ldv@altlinux.org Signed-off-by: Paul Burton paul.burton@mips.com Patchwork: https://patchwork.linux-mips.org/patch/21185/ Cc: Elvira Khabirova lineprinter@altlinux.org Cc: Ralf Baechle ralf@linux-mips.org Cc: James Hogan jhogan@kernel.org Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org # v3.13+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/mips/include/asm/syscall.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/include/asm/syscall.h +++ b/arch/mips/include/asm/syscall.h @@ -51,7 +51,7 @@ static inline unsigned long mips_get_sys #ifdef CONFIG_64BIT case 4: case 5: case 6: case 7: #ifdef CONFIG_MIPS32_O32 - if (test_thread_flag(TIF_32BIT_REGS)) + if (test_tsk_thread_flag(task, TIF_32BIT_REGS)) return get_user(*arg, (int *)usp + n); else #endif