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| author | Douglas Gilbert <dgilbert@interlog.com> | 2020-10-15 14:57:35 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-10-16 09:31:09 -0600 |
| commit | b2a182a40278bc5849730e66bca01a762188ed86 (patch) | |
| tree | 7c7973081881b7ccd96703ec83c51e2aa026a5c2 /lib | |
| parent | a48faebe65b0db55a73b9220c3d919eee849bb79 (diff) | |
| download | linux-stable-b2a182a40278bc5849730e66bca01a762188ed86.tar.gz linux-stable-b2a182a40278bc5849730e66bca01a762188ed86.tar.bz2 linux-stable-b2a182a40278bc5849730e66bca01a762188ed86.zip | |
sgl_alloc_order: fix memory leak
sgl_alloc_order() can fail when 'length' is large on a memory
constrained system. When order > 0 it will potentially be
making several multi-page allocations with the later ones more
likely to fail than the earlier one. So it is important that
sgl_alloc_order() frees up any pages it has obtained before
returning NULL. In the case when order > 0 it calls the wrong
free page function and leaks. In testing the leak was
sufficient to bring down my 8 GiB laptop with OOM.
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/scatterlist.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/scatterlist.c b/lib/scatterlist.c index 5d63a8857f36..c448642e0f78 100644 --- a/lib/scatterlist.c +++ b/lib/scatterlist.c @@ -514,7 +514,7 @@ struct scatterlist *sgl_alloc_order(unsigned long long length, elem_len = min_t(u64, length, PAGE_SIZE << order); page = alloc_pages(gfp, order); if (!page) { - sgl_free(sgl); + sgl_free_order(sgl, order); return NULL; } |