* alloc.c (memory_full) [!SYNC_INPUT]: Fix signal-related race.

Without this fix, if a signal arrives just after memory fills up,
'malloc' might be invoked reentrantly.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index eb0185a8e35..b96fc1f0642 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -3282,12 +3282,16 @@ memory_full (size_t nbytes)
   int enough_free_memory = 0;
   if (SPARE_MEMORY < nbytes)
     {
-      void *p = malloc (SPARE_MEMORY);
+      void *p;
+
+      MALLOC_BLOCK_INPUT;
+      p = malloc (SPARE_MEMORY);
       if (p)
         {
           free (p);
           enough_free_memory = 1;
         }
+      MALLOC_UNBLOCK_INPUT;
     }
 
   if (! enough_free_memory)