erofs: fix offset truncation when shifting pgoff on 32-bit platforms

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On 32-bit platforms, pgoff_t is 32 bits wide, so left-shifting
large arbitrary pgoff_t values by PAGE_SHIFT performs 32-bit arithmetic
and silently truncates the result for pages beyond the 4 GiB boundary.

Cast the page index to loff_t before shifting to produce a correct
64-bit byte offset.

Fixes: 386292919c ("erofs: introduce readmore decompression strategy")
Fixes: 307210c262 ("erofs: verify metadata accesses for file-backed mounts")
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

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Gao Xiang 2026-04-20 11:46:12 +08:00

parent d18a3b5d33

commit c99493ce40

2 changed files with 2 additions and 2 deletions

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2

fs/erofs/data.c

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2

fs/erofs/zdata.c

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