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d31638ff6c
Syzbot reports a slab out of bounds access in squashfs_readpage_block(). This is caused by an attempt to read page index 0x2000000000. This value (start_index) is stored in an integer loop variable which overflows producing a value of 0. This causes a loop which iterates over pages start_index -> end_index to iterate over 0 -> end_index, which ultimately causes an out of bounds page array access. Fix by changing variable to a loff_t, and rename to index to make it clearer it is a page index, and not a loop count. Link: https://lkml.kernel.org/r/20241020232200.837231-1-phillip@squashfs.org.uk Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reported-by: "Lai, Yi" <yi1.lai@linux.intel.com> Closes: https://lore.kernel.org/all/ZwzcnCAosIPqQ9Ie@ly-workstation/ Signed-off-by: Andrew Morton <akpm@linux-foundation.org>