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From: Jingbo Xu <jefflexu@linux.alibaba.com>
To: xiang@kernel.org, chao@kernel.org, huyue2@coolpad.com,
	linux-erofs@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] erofs: fix potential overflow calculating xattr_isize
Date: Fri, 14 Apr 2023 14:18:10 +0800	[thread overview]
Message-ID: <20230414061810.6479-1-jefflexu@linux.alibaba.com> (raw)

Given on-disk i_xattr_icount is 16 bits and xattr_isize is calculated
from i_xattr_icount multiplying 4, xattr_isize has a theoretical maximum
of 256K (64K * 4).

Thus declare xattr_isize as unsigned int to avoid the potential overflow.

Fixes: bfb8674dc044 ("staging: erofs: add erofs in-memory stuffs")
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
 fs/erofs/internal.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 8a563374b518..c86241a32ab3 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -306,7 +306,7 @@ struct erofs_inode {
 
 	unsigned char datalayout;
 	unsigned char inode_isize;
-	unsigned short xattr_isize;
+	unsigned int xattr_isize;
 
 	unsigned int xattr_shared_count;
 	unsigned int *xattr_shared_xattrs;
-- 
2.19.1.6.gb485710b


             reply	other threads:[~2023-04-14  6:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-14  6:18 Jingbo Xu [this message]
2023-04-14  6:28 ` Gao Xiang
2023-04-16 14:47 ` Chao Yu

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