• Chao Yu's avatar
    f2fs: fix overflow of size calculation · 9edcdabf
    Chao Yu authored
    
    
    We have potential overflow issue when calculating size of object, when
    we left shift index with PAGE_CACHE_SHIFT bits, if type of index has only
    32-bits space in 32-bit architecture, left shifting will incur overflow,
    i.e:
    
    pgoff_t index =  0xFFFFFFFF;
    loff_t size = index << PAGE_CACHE_SHIFT;
    size: 0xFFFFF000
    
    So we should cast index with 64-bits type to avoid this issue.
    Signed-off-by: default avatarChao Yu <chao2.yu@samsung.com>
    Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
    9edcdabf
file.c 39 KB