3.16-stable patches

added patches:
	ext4-fix-bug_on-in-mb_free_blocks.patch

diff --git a/queue-3.16/ext4-fix-bug_on-in-mb_free_blocks.patch b/queue-3.16/ext4-fix-bug_on-in-mb_free_blocks.patch
new file mode 100644 (file)
index 0000000..ace4f70
--- /dev/null
+++ b/queue-3.16/ext4-fix-bug_on-in-mb_free_blocks.patch
@@ -0,0 +1,62 @@
+From c99d1e6e83b06744c75d9f5e491ed495a7086b7b Mon Sep 17 00:00:00 2001
+From: Theodore Ts'o <tytso@mit.edu>
+Date: Sat, 23 Aug 2014 17:47:28 -0400
+Subject: ext4: fix BUG_ON in mb_free_blocks()
+
+From: Theodore Ts'o <tytso@mit.edu>
+
+commit c99d1e6e83b06744c75d9f5e491ed495a7086b7b upstream.
+
+If we suffer a block allocation failure (for example due to a memory
+allocation failure), it's possible that we will call
+ext4_discard_allocated_blocks() before we've actually allocated any
+blocks.  In that case, fe_len and fe_start in ac->ac_f_ex will still
+be zero, and this will result in mb_free_blocks(inode, e4b, 0, 0)
+triggering the BUG_ON on mb_free_blocks():
+
+       BUG_ON(last >= (sb->s_blocksize << 3));
+
+Fix this by bailing out of ext4_discard_allocated_blocks() if fs_len
+is zero.
+
+Also fix a missing ext4_mb_unload_buddy() call in
+ext4_discard_allocated_blocks().
+
+Google-Bug-Id: 16844242
+
+Fixes: 86f0afd463215fc3e58020493482faa4ac3a4d69
+Signed-off-by: Theodore Ts'o <tytso@mit.edu>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ fs/ext4/mballoc.c |    5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/fs/ext4/mballoc.c
++++ b/fs/ext4/mballoc.c
+@@ -1412,6 +1412,8 @@ static void mb_free_blocks(struct inode
+       int last = first + count - 1;
+       struct super_block *sb = e4b->bd_sb;
+ 
++      if (WARN_ON(count == 0))
++              return;
+       BUG_ON(last >= (sb->s_blocksize << 3));
+       assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group));
+       /* Don't bother if the block group is corrupt. */
+@@ -3220,6 +3222,8 @@ static void ext4_discard_allocated_block
+       int err;
+ 
+       if (pa == NULL) {
++              if (ac->ac_f_ex.fe_len == 0)
++                      return;
+               err = ext4_mb_load_buddy(ac->ac_sb, ac->ac_f_ex.fe_group, &e4b);
+               if (err) {
+                       /*
+@@ -3234,6 +3238,7 @@ static void ext4_discard_allocated_block
+               mb_free_blocks(ac->ac_inode, &e4b, ac->ac_f_ex.fe_start,
+                              ac->ac_f_ex.fe_len);
+               ext4_unlock_group(ac->ac_sb, ac->ac_f_ex.fe_group);
++              ext4_mb_unload_buddy(&e4b);
+               return;
+       }
+       if (pa->pa_type == MB_INODE_PA)

diff --git a/queue-3.16/series b/queue-3.16/series
index 4d1f4f6691211338aafaa5baa959a3c2c9c52e97..38b20c32f8bebbe8e7e4c4d88494c486cd6bc31b 100644 (file)
--- a/queue-3.16/series
+++ b/queue-3.16/series
@@ -60,3 +60,4 @@ kvm-ppc-book3s-fix-lpcr-one_reg-interface.patch
 kvm-nvmx-fix-acknowledge-interrupt-on-exit-when-apicv-is-in-use.patch
 revert-kvm-x86-increase-the-number-of-fixed-mtrr-regs-to-10.patch
 kvm-iommu-fix-the-third-parameter-of-kvm_iommu_put_pages-cve-2014-3601.patch
+ext4-fix-bug_on-in-mb_free_blocks.patch