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target: Fix inconsistent address passed to kunmap_atomic() in sbc_dif_copy_prot()
In sbc_dif_copy_prot(), the addresses passed to kunmap_atomic() are inconsistent with the addresses which are mapped by kmap_atomic(). That could be problematic if an SG element has its length larger than PAGE_SIZE as kunmap_atomic() will attempt to unmap different page. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -1300,13 +1300,14 @@ void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
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copied += len;
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psg_len -= len;
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kunmap_atomic(addr - sg->offset - offset);
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if (offset >= sg->length) {
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sg = sg_next(sg);
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offset = 0;
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}
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kunmap_atomic(addr);
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}
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kunmap_atomic(paddr);
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kunmap_atomic(paddr - psg->offset);
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}
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}
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EXPORT_SYMBOL(sbc_dif_copy_prot);
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