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uprobes: Do not leak UTASK_BP_HIT if find_active_uprobe() fails 

If handle_swbp()->find_active_uprobe() fails we return with
utask->state = UTASK_BP_HIT.

Change handle_swbp() to reset utask->state at the start. Note
that we do this unconditionally, see the next patch(es).

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2012-09-14 18:03:59 +02:00
parent 1d787d37c8
commit 79d54b249c
1 changed files with 4 additions and 1 deletions
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5
kernel/events/uprobes.c
View File

@ -1468,6 +1468,10 @@ static void handle_swbp(struct pt_regs *regs)
bp_vaddr = uprobe_get_swbp_addr(regs);
uprobe = find_active_uprobe(bp_vaddr, &is_swbp);
utask = current->utask;
if (utask)
utask->state = UTASK_RUNNING;
if (!uprobe) {
if (is_swbp > 0) {
/* No matching uprobe; signal SIGTRAP. */
@ -1486,7 +1490,6 @@ static void handle_swbp(struct pt_regs *regs)
return;
}
utask = current->utask;
if (!utask) {
utask = add_utask();
/* Cannot allocate; re-execute the instruction. */