GNU C Library master sources branch gentoo/2.23 updated. glibc-2.23-79-g3f97c0c

[vapier at sourceware dot org]

This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, gentoo/2.23 has been updated
       via  3f97c0cafa1d661fe2ffa946c215f613beb32cd6 (commit)
      from  cafa0319f8ff701b7edd56e3e244e79abcf84748 (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=3f97c0cafa1d661fe2ffa946c215f613beb32cd6

commit 3f97c0cafa1d661fe2ffa946c215f613beb32cd6
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Jun 21 21:29:21 2016 +0200

    malloc: Avoid premature fallback to mmap [BZ #20284]
    
    Before this change, the while loop in reused_arena which avoids
    returning a corrupt arena would never execute its body if the selected
    arena were not corrupt.  As a result, result == begin after the loop,
    and the function returns NULL, triggering fallback to mmap.
    
    (cherry picked from commit a3b473373ee43a292f5ec68a7fda6b9cfb26a9b0)
    (cherry picked from commit a69d26143b80cb1927481509279577c57bc22ba4)

diff --git a/malloc/arena.c b/malloc/arena.c
index 0e5cc0f..232b6a2 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -795,14 +795,12 @@ reused_arena (mstate avoid_arena)
     {
       result = result->next;
       if (result == begin)
-	break;
+	/* We looped around the arena list.  We could not find any
+	   arena that was either not corrupted or not the one we
+	   wanted to avoid.  */
+	return NULL;
     }
 
-  /* We could not find any arena that was either not corrupted or not the one
-     we wanted to avoid.  */
-  if (result == begin || result == avoid_arena)
-    return NULL;
-
   /* No arena available without contention.  Wait for the next in line.  */
   LIBC_PROBE (memory_arena_reuse_wait, 3, &result->mutex, result, avoid_arena);
   (void) mutex_lock (&result->mutex);

-----------------------------------------------------------------------

Summary of changes:
 malloc/arena.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)


hooks/post-receive
-- 
GNU C Library master sources