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[16/30] staging: sync: Fix error paths

Message ID 1362098606-26469-17-git-send-email-john.stultz@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

John Stultz March 1, 2013, 12:43 a.m. UTC 
From: Rebecca Schultz Zavin <rebecca@android.com>

Check the return value of get_unused_fd to make sure a valid
file descriptor is returned.

Make sure to call put_unused_fd even if an error occurs before
the fd can be used.

Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: dri-devel@lists.freedesktop.org
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drivers/staging/android/sync.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 61c27bd..c4a3c1d 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -647,8 +647,13 @@  static long sync_fence_ioctl_merge(struct sync_fence *fence, unsigned long arg)
 	struct sync_fence *fence2, *fence3;
 	struct sync_merge_data data;
 
-	if (copy_from_user(&data, (void __user *)arg, sizeof(data)))
-		return -EFAULT;
+	if (fd < 0)
+		return fd;
+
+	if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
+		err = -EFAULT;
+		goto err_put_fd;
+	}
 
 	fence2 = sync_fence_fdget(data.fd2);
 	if (fence2 == NULL) {