ramfs: fix nommu mmap with gaps in the page cache
[ Upstream commit50b7d85680
] ramfs needs to check that pages are both physically contiguous and contiguous in the file. If the page cache happens to have, eg, page A for index 0 of the file, no page for index 1, and page A+1 for index 2, then an mmap of the first two pages of the file will succeed when it should fail. Fixes:642fb4d1f1
("[PATCH] NOMMU: Provide shared-writable mmap support on ramfs") Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: David Howells <dhowells@redhat.com> Link: https://lkml.kernel.org/r/20200914122239.GO6583@casper.infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -224,7 +224,7 @@ static unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
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if (!pages)
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if (!pages)
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goto out_free;
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goto out_free;
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nr = find_get_pages(inode->i_mapping, &pgoff, lpages, pages);
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nr = find_get_pages_contig(inode->i_mapping, pgoff, lpages, pages);
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if (nr != lpages)
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if (nr != lpages)
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goto out_free_pages; /* leave if some pages were missing */
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goto out_free_pages; /* leave if some pages were missing */
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