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readahead: fix NULL filp dereference

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commit 70655c06bd upstream.

btrfs relocate_file_extent_cluster() calls us with NULL filp:

  [ 4005.426805] BUG: unable to handle kernel NULL pointer dereference at 00000021
  [ 4005.426818] IP: [<c109a130>] page_cache_sync_readahead+0x18/0x3e

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Yan Zheng <yanzheng@21cn.com>
Reported-by: Kirill A. Shutemov <kirill@shutemov.name>
Tested-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Wu Fengguang 2010-04-06 14:34:53 -07:00 committed by Greg Kroah-Hartman
parent 957c93832c
commit a54573d774
1 changed files with 1 additions and 1 deletions
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2
mm/readahead.c
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@ -502,7 +502,7 @@ void page_cache_sync_readahead(struct address_space *mapping,
return;
/* be dumb */
if (filp->f_mode & FMODE_RANDOM) {
if (filp && (filp->f_mode & FMODE_RANDOM)) {
force_page_cache_readahead(mapping, filp, offset, req_size);
return;
}