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From: Greg KH on 22 Apr 2010 16:30 2.6.33-stable review patch. If anyone has any objections, please let us know. ------------------ From: Wu Fengguang <fengguang.wu(a)intel.com> commit 70655c06bd3f25111312d63985888112aed15ac5 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(a)intel.com> Cc: Yan Zheng <yanzheng(a)21cn.com> Reported-by: Kirill A. Shutemov <kirill(a)shutemov.name> Tested-by: Kirill A. Shutemov <kirill(a)shutemov.name> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de> --- mm/readahead.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/readahead.c +++ b/mm/readahead.c @@ -502,7 +502,7 @@ void page_cache_sync_readahead(struct ad 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |