diff options
| author | Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org> | 2026-07-17 23:34:20 +0530 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2026-07-31 08:40:58 +0200 |
| commit | 0510cb5b23037dbaaf57b8ddd6af32cbfc173ef2 (patch) | |
| tree | bac9819a7f6fd4ec3179f1875b2c0fa0ab45c819 | |
| parent | 94a04ad732c9f8b9554270fc4038a06737de5c22 (diff) | |
dma-pool: fix page leak in atomic_pool_expand() cleanup
atomic_pool_expand() frees the allocated pages from the remove_mapping
error path only when CONFIG_DMA_DIRECT_REMAP is enabled.
When CONFIG_DMA_DIRECT_REMAP is disabled, failures after page allocation,
such as gen_pool_add_virt(), jump to remove_mapping and return without
freeing the pages.
Move __free_pages(page, order) out of the CONFIG_DMA_DIRECT_REMAP block so
that cleanup paths always release the allocation.
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Link: https://lore.kernel.org/r/20260717180442.110954-3-aneesh.kumar@kernel.org
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
| -rw-r--r-- | kernel/dma/pool.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c index 2b2fbb709242..b0303efbc153 100644 --- a/kernel/dma/pool.c +++ b/kernel/dma/pool.c @@ -81,6 +81,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size, { unsigned int order; struct page *page = NULL; + bool leak_pages = false; void *addr; int ret = -ENOMEM; @@ -115,8 +116,10 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size, */ ret = set_memory_decrypted((unsigned long)page_to_virt(page), 1 << order); - if (ret) + if (ret) { + leak_pages = true; goto remove_mapping; + } ret = gen_pool_add_virt(pool, (unsigned long)addr, page_to_phys(page), pool_size, NUMA_NO_NODE); if (ret) @@ -130,14 +133,15 @@ encrypt_mapping: 1 << order); if (WARN_ON_ONCE(ret)) { /* Decrypt succeeded but encrypt failed, purposely leak */ - goto out; + leak_pages = true; } remove_mapping: #ifdef CONFIG_DMA_DIRECT_REMAP dma_common_free_remap(addr, pool_size); free_page: - __free_pages(page, order); #endif + if (!leak_pages) + __free_pages(page, order); out: return ret; } |