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Date: Wed, 19 Oct 2022 10:24:59 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, syzbot+f966c13b1b4fc0403b19@...kaller.appspotmail.com, Yue Hu <huyue2@...lpad.com>, Gao Xiang <hsiangkao@...ux.alibaba.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 6.0 212/862] erofs: fix order >= MAX_ORDER warning due to crafted negative i_size From: Gao Xiang <hsiangkao@...ux.alibaba.com> [ Upstream commit 1dd73601a1cba37a0ed5f89a8662c90191df5873 ] As syzbot reported [1], the root cause is that i_size field is a signed type, and negative i_size is also less than EROFS_BLKSIZ. As a consequence, it's handled as fast symlink unexpectedly. Let's fall back to the generic path to deal with such unusual i_size. [1] https://lore.kernel.org/r/000000000000ac8efa05e7feaa1f@google.com Reported-by: syzbot+f966c13b1b4fc0403b19@...kaller.appspotmail.com Fixes: 431339ba9042 ("staging: erofs: add inode operations") Reviewed-by: Yue Hu <huyue2@...lpad.com> Link: https://lore.kernel.org/r/20220909023948.28925-1-hsiangkao@linux.alibaba.com Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- fs/erofs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index 95a403720e8c..16cf9a283557 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -214,7 +214,7 @@ static int erofs_fill_symlink(struct inode *inode, void *kaddr, /* if it cannot be handled with fast symlink scheme */ if (vi->datalayout != EROFS_INODE_FLAT_INLINE || - inode->i_size >= EROFS_BLKSIZ) { + inode->i_size >= EROFS_BLKSIZ || inode->i_size < 0) { inode->i_op = &erofs_symlink_iops; return 0; } -- 2.35.1
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