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| author | Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> | 2014-01-21 15:29:59 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2014-01-22 08:22:40 +0400 |
| commit | 9967d8ac5c0f3e730a21abefe4c889c724f3b212 (patch) | |
| tree | 0eb48ed7aa3c5f5b374545c814a402392d3c6a1e /arch/powerpc/kernel/vdso64 | |
| parent | 26d580575b4b8c3c83137315c9a2a77e60a2f716 (diff) | |
| download | linux-9967d8ac5c0f3e730a21abefe4c889c724f3b212.tar.xz | |
null_blk: Null pointer deference problem in alloc_page_buffers
If we load the null_blk module with bs=8k we get following oops:
[ 3819.812190] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 3819.812387] IP: [<ffffffff81170aa5>] create_empty_buffers+0x28/0xaf
[ 3819.812527] PGD 219244067 PUD 215a06067 PMD 0
[ 3819.812640] Oops: 0000 [#1] SMP
[ 3819.812772] Modules linked in: null_blk(+)
Fix that by resetting block size to PAGE_SIZE if it is greater than PAGE_SIZE
Reported-by: Sumanth <sumantk2@linux.vnet.ibm.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Reviewed-by: Matias Bjorling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'arch/powerpc/kernel/vdso64')
0 files changed, 0 insertions, 0 deletions