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| author | Li RongQing <lirongqing@baidu.com> | 2019-04-04 10:58:01 +0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-04-07 14:36:04 -0700 |
| commit | 9dc6488e84b0f64df17672271664752488cd6a25 (patch) | |
| tree | b72072d511728753fabada8b2b7cce287072b288 /drivers/nvdimm | |
| parent | d2e5b6436c28e7ee4988497d31122e06217876fb (diff) | |
| download | lwn-9dc6488e84b0f64df17672271664752488cd6a25.tar.gz lwn-9dc6488e84b0f64df17672271664752488cd6a25.zip | |
libnvdimm/pmem: fix a possible OOB access when read and write pmem
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: 98cc093cba1e ("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>
Diffstat (limited to 'drivers/nvdimm')
| -rw-r--r-- | drivers/nvdimm/pmem.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index bc2f700feef8..0279eb1da3ef 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -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; } |