5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guangshuo Li <lgs201920130244@gmail.com>

commit cc9a8e238e42c1f43b98c097995137d644b69245 upstream.

kcalloc() may fail. When WS is non-zero and allocation fails, ectx.ws
remains NULL while ectx.ws_size is set, leading to a potential NULL
pointer dereference in atom_get_src_int() when accessing WS entries.

Return -ENOMEM on allocation failure to avoid the NULL dereference.

Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[ Roman: added parentheses to the 'if' statement, matching the upstream commit. ]
Signed-off-by: Roman Demidov <roman.demidov.nn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/amd/amdgpu/atom.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/atom.c
+++ b/drivers/gpu/drm/amd/amdgpu/atom.c
@@ -1226,10 +1226,15 @@ static int amdgpu_atom_execute_table_loc
 	ectx.ps = params;
 	ectx.abort = false;
 	ectx.last_jump = 0;
-	if (ws)
+	if (ws) {
 		ectx.ws = kcalloc(4, ws, GFP_KERNEL);
-	else
+		if (!ectx.ws) {
+			ret = -ENOMEM;
+			goto free;
+		}
+	} else {
 		ectx.ws = NULL;
+	}
 
 	debug_depth++;
 	while (1) {