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libnvdimm/pmem: fix a possible OOB access when read and write pmem

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If offset is not zero and length is bigger than PAGE_SIZE,
this will cause to out of boundary access to a page memory

Fixes: 98cc093cba ("block, THP: make block_device_operations.rw_page support THP")
Co-developed-by: Liang ZhiCheng <liangzhicheng@baidu.com>
Signed-off-by: Liang ZhiCheng <liangzhicheng@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Li RongQing 2019-04-04 10:58:01 +08:00 committed by Dan Williams
parent d2e5b6436c
commit 9dc6488e84
1 changed files with 4 additions and 4 deletions
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8
drivers/nvdimm/pmem.c
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@ -113,13 +113,13 @@ static void write_pmem(void *pmem_addr, struct page *page,
while (len) {
mem = kmap_atomic(page);
chunk = min_t(unsigned int, len, PAGE_SIZE);
chunk = min_t(unsigned int, len, PAGE_SIZE - off);
memcpy_flushcache(pmem_addr, mem + off, chunk);
kunmap_atomic(mem);
len -= chunk;
off = 0;
page++;
pmem_addr += PAGE_SIZE;
pmem_addr += chunk;
}
}
@ -132,7 +132,7 @@ static blk_status_t read_pmem(struct page *page, unsigned int off,
while (len) {
mem = kmap_atomic(page);
chunk = min_t(unsigned int, len, PAGE_SIZE);
chunk = min_t(unsigned int, len, PAGE_SIZE - off);
rem = memcpy_mcsafe(mem + off, pmem_addr, chunk);
kunmap_atomic(mem);
if (rem)
@ -140,7 +140,7 @@ static blk_status_t read_pmem(struct page *page, unsigned int off,
len -= chunk;
off = 0;
page++;
pmem_addr += PAGE_SIZE;
pmem_addr += chunk;
}
return BLK_STS_OK;
}