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uprobes: Fix utask->xol_vaddr leak in pre_ssout()

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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 <oleg@redhat.com>
Acked-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2012-12-31 18:12:48 +01:00
parent a6cb3f6d51
commit aba51024e7
1 changed files with 8 additions and 1 deletions
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9
kernel/events/uprobes.c
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@ -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;
}
/*