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SubjectRe: [PATCH 41/49] ext4: Add multi block allocator for ext4
The latest version of the mballoc patch in the ext4dev git patch queue
has a potential uninitialized use: CC [M] fs/ext4/mballoc.o

fs/ext4/mballoc.c: In function ‘ext4_mb_free_blocks’:
fs/ext4/mballoc.c:4408: warning: ‘bitmap_bh’ may be used uninitialized in this function

There are 2 gotos which will call put_bh on a NULL bitmap_bh.

Signed-off-by: Eric Sandeen <>

Index: linux-2.6.24-rc6-mm1/fs/ext4/mballoc.c
--- linux-2.6.24-rc6-mm1.orig/fs/ext4/mballoc.c
+++ linux-2.6.24-rc6-mm1/fs/ext4/mballoc.c
@@ -4405,7 +4405,7 @@ void ext4_mb_free_blocks(handle_t *handl
unsigned long block, unsigned long count,
int metadata, unsigned long *freed)
- struct buffer_head *bitmap_bh;
+ struct buffer_head *bitmap_bh = NULL;
struct super_block *sb = inode->i_sb;
struct ext4_allocation_context ac;
struct ext4_group_desc *gdp;
@@ -4546,7 +4546,8 @@ do_more:
sb->s_dirt = 1;
- put_bh(bitmap_bh);
+ if (bitmap_bh)
+ put_bh(bitmap_bh);
ext4_std_error(sb, err);
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