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mm/memory-failure: cast index to loff_t before shifting it
commit39ebd6dce6
upstream. On 32-bit systems, we'll lose the top bits of index because arithmetic will be performed in unsigned long instead of unsigned long long. This affects files over 4GB in size. Link: https://lkml.kernel.org/r/20231218135837.3310403-4-willy@infradead.org Fixes:6100e34b25
("mm, memory_failure: Teach memory_failure() about dev_pagemap pages") Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1560,7 +1560,7 @@ static void unmap_and_kill(struct list_head *to_kill, unsigned long pfn,
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* mapping being torn down is communicated in siginfo, see
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* kill_proc()
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*/
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loff_t start = (index << PAGE_SHIFT) & ~(size - 1);
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loff_t start = ((loff_t)index << PAGE_SHIFT) & ~(size - 1);
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unmap_mapping_range(mapping, start, size, 0);
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}
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