6.6-stable review patch. If anyone has any objections, please let me know.
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From: Matthew Wilcox (Oracle) willy@infradead.org
commit 39ebd6dce62d8cfe3864e16148927a139f11bc9a 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: 6100e34b2526 ("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 --- mm/memory-failure.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1705,7 +1705,7 @@ static void unmap_and_kill(struct list_h * mapping being torn down is communicated in siginfo, see * kill_proc() */ - loff_t start = (index << PAGE_SHIFT) & ~(size - 1); + loff_t start = ((loff_t)index << PAGE_SHIFT) & ~(size - 1);
unmap_mapping_range(mapping, start, size, 0); }