diff options
author | Mike Kravetz <mike.kravetz@oracle.com> | 2018-04-06 02:18:21 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-06 07:36:21 +0300 |
commit | 5df63c2a149ae65a9ec239e7c2af44efa6f79beb (patch) | |
tree | 5d2d3541de5ae08a28a208c069669f75cf160b07 /lib/bitmap.c | |
parent | 7bbaf27d9c83037b6e60a818e57bdbedf6bc15be (diff) |
hugetlbfs: fix bug in pgoff overflow checking
This is a fix for a regression in 32 bit kernels caused by an invalid
check for pgoff overflow in hugetlbfs mmap setup. The check incorrectly
specified that the size of a loff_t was the same as the size of a long.
The regression prevents mapping hugetlbfs files at offsets greater than
4GB on 32 bit kernels.
On 32 bit kernels conversion from a page based unsigned long can not
overflow a loff_t byte offset. Therefore, skip this check if
sizeof(unsigned long) != sizeof(loff_t).
Link: http://lkml.kernel.org/r/20180330145402.5053-1-mike.kravetz@oracle.com
Fixes: 63489f8e8211 ("hugetlbfs: check for pgoff value overflow")
Reported-by: Dan Rue <dan.rue@linaro.org>
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Tested-by: Anders Roxell <anders.roxell@linaro.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Yisheng Xie <xieyisheng1@huawei.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Nic Losby <blurbdust@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/bitmap.c')
0 files changed, 0 insertions, 0 deletions