Messages in this thread Patch in this message | | | Date | Sun, 29 May 2011 22:54:07 +0300 | From | Dan Carpenter <> | Subject | [patch 2/2] ptp: fix some locking bugs in ptp_read() |
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There was an unlock missing on an error path, and a double unlock on another error path.
Signed-off-by: Dan Carpenter <error27@gmail.com>
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index 93fa22d..e7f301da2 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -130,8 +130,10 @@ ssize_t ptp_read(struct posix_clock *pc, return -ERESTARTSYS; } - if (ptp->defunct) + if (ptp->defunct) { + mutex_unlock(&ptp->tsevq_mux); return -ENODEV; + } spin_lock_irqsave(&queue->lock, flags); @@ -151,10 +153,8 @@ ssize_t ptp_read(struct posix_clock *pc, mutex_unlock(&ptp->tsevq_mux); - if (copy_to_user(buf, event, cnt)) { - mutex_unlock(&ptp->tsevq_mux); + if (copy_to_user(buf, event, cnt)) return -EFAULT; - } return cnt; }
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