FAILED: patch "[PATCH] drm/i915: Fix bug in user proto-context creation that leaked" failed to apply to 5.14-stable tree

The patch below does not apply to the 5.14-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From af628cdd64e11f03181a5a19645768ed4687bda4 Mon Sep 17 00:00:00 2001
From: Matthew Brost <[email protected]>
Date: Fri, 1 Oct 2021 08:58:25 -0700
Subject: [PATCH] drm/i915: Fix bug in user proto-context creation that leaked
contexts

Set number of engines before attempting to create contexts so the function free_engines can clean up properly. Also check return of alloc_engines for NULL.

v2:
(Tvrtko)
- Send as stand alone patch
(John Harrison)
- Check for alloc_engines returning NULL
v3:
(Checkpatch / Tvrtko)
- Remove braces around single line if statement

index 9ccf4b29b82e..166bb46408a9 100644
@@ -937,6 +937,10 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
 	unsigned int n;
 
 	e = alloc_engines(num_engines);
+	if (!e)
+		return ERR_PTR(-ENOMEM);
+	e->num_engines = num_engines;
+
 	for (n = 0; n < num_engines; n++) {
 		struct intel_context *ce;
 		int ret;

@@ -970,7 +974,6 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
 			goto free_engines;
 		}
 	}
-	e->num_engines = num_engines;
 
 	return e;