Commit fb68afd2 authored by Dmitry V. Levin's avatar Dmitry V. Levin Committed by Greg Kroah-Hartman

mips: fix mips_get_syscall_arg o32 check

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: c0ff3c53 ("MIPS: Enable HAVE_ARCH_TRACEHOOK.")
Signed-off-by: default avatarDmitry V. Levin <ldv@altlinux.org>
Signed-off-by: default avatarPaul 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: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c18ce9df
......@@ -51,7 +51,7 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
#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
......
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