In the range_cont case, range_start is set to index << PAGE_CACHE_SHIFT, but index is a pgoff_t and range_start is loff_t, so we can get truncation of the value on 32-bit platforms. Fix this by adding the standard loff_t cast. This is a data interity bug (depending on how range_cont is used). Signed-off-by: Nick Piggin <npiggin@xxxxxxx> --- Index: linux-2.6/mm/page-writeback.c =================================================================== --- linux-2.6.orig/mm/page-writeback.c +++ linux-2.6/mm/page-writeback.c @@ -976,7 +976,7 @@ again: mapping->writeback_index = index; if (wbc->range_cont) - wbc->range_start = index << PAGE_CACHE_SHIFT; + wbc->range_start = (loff_t)index << PAGE_CACHE_SHIFT; return ret; } EXPORT_SYMBOL(write_cache_pages); -- -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
