1 files changed, 10 insertions, 9 deletions

diff --git a/fs/coredump.c b/fs/coredump.c
index 90d7cee54347..56a9ab963a40 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -45,26 +45,28 @@
 #include <trace/events/sched.h>
 
 int core_uses_pid;
-char core_pattern[CORENAME_MAX_SIZE] = "core";
 unsigned int core_pipe_limit;
+char core_pattern[CORENAME_MAX_SIZE] = "core";
+static int core_name_size = CORENAME_MAX_SIZE;
 
 struct core_name {
         char *corename;
         int used, size;
 };
-static atomic_t call_count = ATOMIC_INIT(1);
 
 /* The maximal length of core_pattern is also specified in sysctl.c */
 
-static int expand_corename(struct core_name *cn)
+static int expand_corename(struct core_name *cn, int size)
 {
-        int size = CORENAME_MAX_SIZE * atomic_inc_return(&call_count);
         char *corename = krealloc(cn->corename, size, GFP_KERNEL);
 
         if (!corename)
                 return -ENOMEM;
 
-        cn->size = size;
+        if (size > core_name_size) /* racy but harmless */
+                core_name_size = size;
+
+        cn->size = ksize(corename);
         cn->corename = corename;
         return 0;
 }
@@ -81,7 +83,7 @@ again:
                 return 0;
         }
 
-        if (!expand_corename(cn))
+        if (!expand_corename(cn, cn->size + need - free + 1))
                 goto again;
 
         return -ENOMEM;
@@ -160,9 +162,8 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
         int err = 0;
 
         cn->used = 0;
-        cn->size = CORENAME_MAX_SIZE * atomic_read(&call_count);
-        cn->corename = kmalloc(cn->size, GFP_KERNEL);
-        if (!cn->corename)
+        cn->corename = NULL;
+        if (expand_corename(cn, core_name_size))
                 return -ENOMEM;
 
         /* Repeat as long as we have more pattern to process and more output