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erofs: fix potential overflow calculating xattr_isize

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[ Upstream commit 1b3567a1969b26f709d82a874498c0754ea841c3 ]

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: bfb8674dc0 ("staging: erofs: add erofs in-memory stuffs")
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20230414061810.6479-1-jefflexu@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jingbo Xu 2023-04-14 14:18:10 +08:00 • committed by Greg Kroah-Hartman
commit 9773c58594
1 changed files with 1 additions and 1 deletions
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2
fs/erofs/internal.h
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@ -226,7 +226,7 @@ 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;