The patch titled
fix some conversion overflows
has been added to the -mm tree. Its filename is
fix-some-conversion-overflows.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fix some conversion overflows
From: Nick Piggin <npiggin@xxxxxxx>
Fix page index to offset conversion overflows in buffer layer, ecryptfs,
and ocfs2.
It would be nice to convert the whole tree to page_offset, but for now
just fix the bugs.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Cc: Michael Halcrow <mhalcrow@xxxxxxxxxx>
Cc: Mark Fasheh <mark.fasheh@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/buffer.c | 2 +-
fs/ecryptfs/mmap.c | 5 ++---
fs/ocfs2/mmap.c | 2 +-
3 files changed, 4 insertions(+), 5 deletions(-)
diff -puN fs/buffer.c~fix-some-conversion-overflows fs/buffer.c
--- a/fs/buffer.c~fix-some-conversion-overflows
+++ a/fs/buffer.c
@@ -2221,7 +2221,7 @@ block_page_mkwrite(struct vm_area_struct
lock_page(page);
size = i_size_read(inode);
if ((page->mapping != inode->i_mapping) ||
- ((page->index << PAGE_CACHE_SHIFT) > size)) {
+ (page_offset(page) > size)) {
/* page got truncated out from underneath us */
goto out_unlock;
}
diff -puN fs/ecryptfs/mmap.c~fix-some-conversion-overflows fs/ecryptfs/mmap.c
--- a/fs/ecryptfs/mmap.c~fix-some-conversion-overflows
+++ a/fs/ecryptfs/mmap.c
@@ -409,8 +409,7 @@ static int ecryptfs_prepare_write(struct
if (!PageUptodate(page))
rc = ecryptfs_do_readpage(file, page, page->index);
if (page->index != 0) {
- loff_t end_of_prev_pg_pos =
- (((loff_t)page->index << PAGE_CACHE_SHIFT) - 1);
+ loff_t end_of_prev_pg_pos = page_offset(page) - 1;
if (end_of_prev_pg_pos > i_size_read(page->mapping->host)) {
rc = ecryptfs_truncate(file->f_path.dentry,
@@ -736,7 +735,7 @@ static int ecryptfs_commit_write(struct
goto out;
}
inode->i_blocks = lower_inode->i_blocks;
- pos = (page->index << PAGE_CACHE_SHIFT) + to;
+ pos = page_offset(page) + to;
if (pos > i_size_read(inode)) {
i_size_write(inode, pos);
ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
diff -puN fs/ocfs2/mmap.c~fix-some-conversion-overflows fs/ocfs2/mmap.c
--- a/fs/ocfs2/mmap.c~fix-some-conversion-overflows
+++ a/fs/ocfs2/mmap.c
@@ -89,7 +89,7 @@ static int __ocfs2_page_mkwrite(struct i
{
int ret;
struct address_space *mapping = inode->i_mapping;
- loff_t pos = page->index << PAGE_CACHE_SHIFT;
+ loff_t pos = page_offset(page);
unsigned int len = PAGE_CACHE_SIZE;
pgoff_t last_index;
struct page *locked_page = NULL;
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
origin.patch
fix-some-conversion-overflows.patch
mm-revert-kernel_ds-buffered-write-optimisation.patch
revert-81b0c8713385ce1b1b9058e916edcf9561ad76d6.patch
revert-6527c2bdf1f833cc18e8f42bd97973d583e4aa83.patch
mm-clean-up-buffered-write-code.patch
mm-debug-write-deadlocks.patch
mm-trim-more-holes.patch
mm-buffered-write-cleanup.patch
mm-write-iovec-cleanup.patch
mm-fix-pagecache-write-deadlocks.patch
mm-buffered-write-iterator.patch
fs-fix-data-loss-on-error.patch
fs-introduce-write_begin-write_end-and-perform_write-aops.patch
introduce-write_begin-write_end-aops-important-fix.patch
mm-restore-kernel_ds-optimisations.patch
implement-simple-fs-aops.patch
block_dev-convert-to-new-aops.patch
ext2-convert-to-new-aops.patch
ext3-convert-to-new-aops.patch
ext3-convert-to-new-aops-fix.patch
ext4-convert-to-new-aops.patch
ext4-convert-to-new-aops-fix.patch
xfs-convert-to-new-aops.patch
fs-new-cont-helpers.patch
fat-convert-to-new-aops.patch
hfs-convert-to-new-aops.patch
hfsplus-convert-to-new-aops.patch
hpfs-convert-to-new-aops.patch
bfs-convert-to-new-aops.patch
qnx4-convert-to-new-aops.patch
reiserfs-use-generic-write.patch
reiserfs-convert-to-new-aops.patch
reiserfs-convert-to-new-aops-fix.patch
reiserfs-use-generic_cont_expand_simple.patch
with-reiserfs-no-longer-using-the-weird-generic_cont_expand-remove-it-completely.patch
nfs-convert-to-new-aops.patch
smb-convert-to-new-aops.patch
fuse-convert-to-new-aops.patch
hostfs-convert-to-new-aops.patch
hostfs-convert-to-new-aops-fix.patch
jffs2-convert-to-new-aops.patch
ufs-convert-to-new-aops.patch
udf-convert-to-new-aops.patch
udf-convert-to-new-aops-fix.patch
sysv-convert-to-new-aops.patch
minix-convert-to-new-aops.patch
jfs-convert-to-new-aops.patch
fs-adfs-convert-to-new-aops.patch
fs-affs-convert-to-new-aops.patch
affs-convert-to-new-aops-fix.patch
ocfs2-convert-to-new-aops.patch
fs-remove-some-aop_truncated_page.patch
fs-reiserfs-cleanups.patch
fs-introduce-write_begin-write_end-and-perform_write-aops-revoke.patch
reiser4-fix-for-new-aops-patches.patch
-
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