From: Jakob Koschel <jakobkoschel@gmail.com> stable inclusion from stable-v4.19.247 commit 385edd3ce5b4b1e9d31f474a5e35a39779ec1110 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IBP3SH CVE: CVE-2022-49425 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 2aaf51dd39afb6d01d13f1e6fe20b684733b37d5 ] The list iterator variable will be a bogus pointer if no break was hit. Dereferencing it (cur->page in this case) could load an out-of-bounds/undefined value making it unsafe to use that in the comparision to determine if the specific element was found. Since 'cur->page' *can* be out-ouf-bounds it cannot be guaranteed that by chance (or intention of an attacker) it matches the value of 'page' even though the correct element was not found. This is fixed by using a separate list iterator variable for the loop and only setting the original variable if a suitable element was found. Then determing if the element was found is simply checking if the variable is set. Fixes: 8c242db9b8c0 ("f2fs: fix stale ATOMIC_WRITTEN_PAGE private pointer") Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Wupeng Ma <mawupeng1@huawei.com> --- fs/f2fs/segment.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 0e3e590a250f..6fbf0471323e 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -354,16 +354,19 @@ void f2fs_drop_inmem_page(struct inode *inode, struct page *page) struct f2fs_sb_info *sbi = F2FS_I_SB(inode); struct list_head *head = &fi->inmem_pages; struct inmem_pages *cur = NULL; + struct inmem_pages *tmp; f2fs_bug_on(sbi, !IS_ATOMIC_WRITTEN_PAGE(page)); mutex_lock(&fi->inmem_lock); - list_for_each_entry(cur, head, list) { - if (cur->page == page) + list_for_each_entry(tmp, head, list) { + if (tmp->page == page) { + cur = tmp; break; + } } - f2fs_bug_on(sbi, list_empty(head) || cur->page != page); + f2fs_bug_on(sbi, !cur); list_del(&cur->list); mutex_unlock(&fi->inmem_lock); -- 2.43.0