From e9f1638750db342fbf26fc9477a970ab2e3e439d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Wed, 25 Mar 2020 18:32:41 +0100
Subject: [PATCH] shm: handle ftruncate failure

---
 shm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/shm.c b/shm.c
index dc633ae3..7ac1f6c8 100644
--- a/shm.c
+++ b/shm.c
@@ -264,8 +264,12 @@ shm_get_buffer(struct wl_shm *shm, int width, int height, unsigned long cookie,
     if (scrollable && !can_punch_hole) {
         initial_offset = 0;
         memfd_size = size;
-        ftruncate(pool_fd, memfd_size);
         scrollable = false;
+
+        if (ftruncate(pool_fd, memfd_size) < 0) {
+            LOG_ERRNO("failed to set size of SHM backing memory file");
+            goto err;
+        }
     }
 
     real_mmapped = mmap(