4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx>
commit ca86c9ef2b322ebf24772009fdea037688cbdac1 upstream.
arch_uprobe_pre_xol needs to emulate a branch if a branch instruction
has been replaced with a breakpoint, but in fact an uninitialised local
variable was passed to the emulator routine instead of the original
instruction
Signed-off-by: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx>
Fixes: 40e084a506eb ('MIPS: Add uprobes support.')
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/14300/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/uprobes.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/mips/kernel/uprobes.c
+++ b/arch/mips/kernel/uprobes.c
@@ -157,7 +157,6 @@ bool is_trap_insn(uprobe_opcode_t *insn)
int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs)
{
struct uprobe_task *utask = current->utask;
- union mips_instruction insn;
/*
* Now find the EPC where to resume after the breakpoint has been
@@ -168,10 +167,10 @@ int arch_uprobe_pre_xol(struct arch_upro
unsigned long epc;
epc = regs->cp0_epc;
- __compute_return_epc_for_insn(regs, insn);
+ __compute_return_epc_for_insn(regs,
+ (union mips_instruction) aup->insn[0]);
aup->resume_epc = regs->cp0_epc;
}
-
utask->autask.saved_trap_nr = current->thread.trap_nr;
current->thread.trap_nr = UPROBE_TRAP_NR;
regs->cp0_epc = current->utask->xol_vaddr;
