linux-kernel - [PATCH libdrm 1/2] Return an -ENODEV from drmGetDevice() when no device was found.

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Date:   Fri, 21 Oct 2016 10:12:39 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH libdrm 1/2] Return an -ENODEV from drmGetDevice() when no device was found.

From: Rob Herring <robh@...nel.org>

Fixes crashes in Mesa on platform device, which expected *device to
have a device when 0 was returned.

(code from a paste by Rob, commit message by anholt)

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 xf86drm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xf86drm.c b/xf86drm.c
index 9cfca49ddfda..9b52889e4cef 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -3181,6 +3181,8 @@ int drmGetDevice(int fd, drmDevicePtr *device)
 
     closedir(sysdir);
     free(local_devices);
+    if (*device == NULL)
+	return -ENODEV;
     return 0;
 
 free_devices:
-- 
2.9.3