diff options
| author | Nick Piggin <npiggin@suse.de> | 2007-01-20 22:16:03 +0100 |
|---|---|---|
| committer | Adrian Bunk <bunk@stusta.de> | 2007-01-20 22:16:03 +0100 |
| commit | 01f02a48774e7ec4fedd6efeed0f15cb6f04b78a (patch) | |
| tree | b4011087a8aa0d8c35008ce08553ed26680503a7 | |
| parent | ca634cfa84e5aed7b62af887d1bb921a8cb35e32 (diff) | |
mm: fix bug in set_page_dirty_buffers
This was triggered, but not the fault of, the dirty page accounting
patches. Suitable for -stable as well, after it goes upstream.
Unable to handle kernel NULL pointer dereference at virtual address 0000004c
EIP is at _spin_lock+0x12/0x66
Call Trace:
[<401766e7>] __set_page_dirty_buffers+0x15/0xc0
[<401401e7>] set_page_dirty+0x2c/0x51
[<40140db2>] set_page_dirty_balance+0xb/0x3b
[<40145d29>] __do_fault+0x1d8/0x279
[<40147059>] __handle_mm_fault+0x125/0x951
[<401133f1>] do_page_fault+0x440/0x59f
[<4034d0c1>] error_code+0x39/0x40
[<08048a33>] 0x8048a33
=======================
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
| -rw-r--r-- | fs/buffer.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 8a17ebb9742..6d8b588a996 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -840,7 +840,10 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode); */ int __set_page_dirty_buffers(struct page *page) { - struct address_space * const mapping = page->mapping; + struct address_space * const mapping = page_mapping(page); + + if (unlikely(!mapping)) + return !TestSetPageDirty(page); spin_lock(&mapping->private_lock); if (page_has_buffers(page)) { |