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[PATCH] mm: 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: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-10-10 04:36:54 +02:00 committed by Linus Torvalds
parent 1601ff0e29
commit ebf7a227dd
1 changed files with 4 additions and 1 deletions
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5
fs/buffer.c
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@ -701,7 +701,10 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
*/ */
int __set_page_dirty_buffers(struct page *page) 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); spin_lock(&mapping->private_lock);
if (page_has_buffers(page)) { if (page_has_buffers(page)) {