1 files changed, 15 insertions, 3 deletions

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index a2ed82b4808c..1f02e3bbfc1d 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1530,14 +1530,26 @@ static void handle_swbp(struct pt_regs *regs)
         struct uprobe_task *utask;
         struct uprobe *uprobe;
         unsigned long bp_vaddr;
-        int is_swbp;
+        int uninitialized_var(is_swbp);
 
         bp_vaddr = uprobe_get_swbp_addr(regs);
         uprobe = find_active_uprobe(bp_vaddr, &is_swbp);
 
         if (!uprobe) {
-                /* No matching uprobe; signal SIGTRAP. */
-                send_sig(SIGTRAP, current, 0);
+                if (is_swbp > 0) {
+                        /* No matching uprobe; signal SIGTRAP. */
+                        send_sig(SIGTRAP, current, 0);
+                } else {
+                        /*
+                         * Either we raced with uprobe_unregister() or we can't
+                         * access this memory. The latter is only possible if
+                         * another thread plays with our ->mm. In both cases
+                         * we can simply restart. If this vma was unmapped we
+                         * can pretend this insn was not executed yet and get
+                         * the (correct) SIGSEGV after restart.
+                         */
+                        instruction_pointer_set(regs, bp_vaddr);
+                }
                 return;
         }