Patchwork [stable-0.15,32/36] Error check find_ram_offset

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Submitter Andreas Färber
Date March 28, 2012, 12:52 p.m.
Message ID <1332939159-16434-33-git-send-email-afaerber@suse.de>
Download mbox | patch
Permalink /patch/149253/
State New
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Comments

Andreas Färber - March 28, 2012, 12:52 p.m.
From: Alex Williamson <alex.williamson@redhat.com>

Spotted via code review, we initialize offset to 0 to avoid a
compiler warning, but in the unlikely case that offset is
never set to something else, we should abort instead of return
a value that will almost certainly cause problems.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit 3e837b2c05bc63fe2226baf3c29923d5a688593f)

Signed-off-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 exec.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

Patch

diff --git a/exec.c b/exec.c
index 6fb589b..537a49f 100644
--- a/exec.c
+++ b/exec.c
@@ -2863,7 +2863,7 @@  static void *file_ram_alloc(RAMBlock *block,
 static ram_addr_t find_ram_offset(ram_addr_t size)
 {
     RAMBlock *block, *next_block;
-    ram_addr_t offset = 0, mingap = RAM_ADDR_MAX;
+    ram_addr_t offset = RAM_ADDR_MAX, mingap = RAM_ADDR_MAX;
 
     if (QLIST_EMPTY(&ram_list.blocks))
         return 0;
@@ -2879,10 +2879,17 @@  static ram_addr_t find_ram_offset(ram_addr_t size)
             }
         }
         if (next - end >= size && next - end < mingap) {
-            offset =  end;
+            offset = end;
             mingap = next - end;
         }
     }
+
+    if (offset == RAM_ADDR_MAX) {
+        fprintf(stderr, "Failed to find gap of requested size: %" PRIu64 "\n",
+                (uint64_t)size);
+        abort();
+    }
+
     return offset;
 }