[PATCH i-g-t v4 3/6] tests/kms_ccs: Prevent segfault if pipe is not supported

Gabriel Krisman Bertazi
2017-09-27T18:34:39Z

for_each_plane_on_pipe() indexes bad memory when iterating over an invalid
pipe. Make sure the pipe exists before trying to use it. This prevents
the crash below:

root@ideacentre:~# igt-gpu-tools/tests/kms_ccs --r pipe-D-crc-sprite-planes-basic
IGT-Version: 1.19-g59f0e3d182a8 (x86_64) (Linux: 4.13.0-rc6.intel-boxes+x86_64)
Received signal SIGSEGV.
Stack trace:
#0 [fatal_sig_handler+0x185]
#1 [killpg+0x40]
#2 [__real_main485+0x2de]
#3 [main+0x3f]
#4 [__libc_start_main+0xf1]
#5 [_start+0x2a]
#6 [<unknown>+0x2a]
Subtest pipe-D-crc-sprite-planes-basic: CRASH (0.004s)

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
---
tests/kms_ccs.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tests/kms_ccs.c b/tests/kms_ccs.c
index 775c6999699f..73025a1e019f 100644
--- a/tests/kms_ccs.c
+++ b/tests/kms_ccs.c
@@ -503,6 +503,9 @@ igt_main

data.flags = TEST_CRC;
igt_subtest_f("pipe-%s-crc-sprite-planes-basic", pipe_name) {
+
+ igt_display_require_output_on_pipe(&data.display, data.pipe);
+
for_each_plane_on_pipe(&data.display, data.pipe, data.plane) {
if (data.plane->type == DRM_PLANE_TYPE_PRIMARY)
continue;
--
2.11.0