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Cramfs: fix abad comparison when wrap-arounds occur
commit 672ca9dd13
upstream.
It is possible for corrupted filesystem images to produce very large
block offsets that may wrap when a length is added, and wrongly pass
the buffer size test.
Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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@ -202,7 +202,8 @@ static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset,
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continue;
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blk_offset = (blocknr - buffer_blocknr[i]) << PAGE_SHIFT;
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blk_offset += offset;
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if (blk_offset + len > BUFFER_SIZE)
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if (blk_offset > BUFFER_SIZE ||
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blk_offset + len > BUFFER_SIZE)
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continue;
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return read_buffers[i] + blk_offset;
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}
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