Gitweb: http://git.kernel.org/linus/70655c06bd3f25111312d63985888112aed15ac5
Commit: 70655c06bd3f25111312d63985888112aed15ac5
Parent: 12765517d9dbb477a2432375938f1eb5bdbcb532
Author: Wu Fengguang <fengguang.wu@intel.com>
AuthorDate: Tue Apr 6 14:34:53 2010 -0700
Committer: Linus Torvalds <torvalds@linux-foundation.org>
CommitDate: Wed Apr 7 08:38:03 2010 -0700
readahead: fix NULL filp dereference
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>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/readahead.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 999b54b..dfa9a1a 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -503,7 +503,7 @@ 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;
}
--
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