From aba51024e7159c93914557caaa2b8cda26331091 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Mon, 31 Dec 2012 18:12:48 +0100 Subject: [PATCH] uprobes: Fix utask->xol_vaddr leak in pre_ssout() pre_ssout() should do xol_free_insn_slot() if arch_uprobe_pre_xol() fails, otherwise nobody will free the allocated slot. Signed-off-by: Oleg Nesterov Acked-by: Anton Arapov Acked-by: Srikar Dronamraju --- kernel/events/uprobes.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 8d9c5bcb110..0527379dac5 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1306,6 +1306,7 @@ pre_ssout(struct uprobe *uprobe, struct pt_regs *regs, unsigned long bp_vaddr) { struct uprobe_task *utask; unsigned long xol_vaddr; + int err; utask = current->utask; @@ -1316,7 +1317,13 @@ pre_ssout(struct uprobe *uprobe, struct pt_regs *regs, unsigned long bp_vaddr) utask->xol_vaddr = xol_vaddr; utask->vaddr = bp_vaddr; - return arch_uprobe_pre_xol(&uprobe->arch, regs); + err = arch_uprobe_pre_xol(&uprobe->arch, regs); + if (unlikely(err)) { + xol_free_insn_slot(current); + return err; + } + + return 0; } /* -- 2.20.1