iommufd/selftest: Fix dmabuf leak in iommufd_test_dmabuf_get()

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When dma_buf_export() succeeds but dma_buf_fd() fails (e.g. -EMFILE from
fd exhaustion), the dmabuf is leaked with no dma_buf_put() called.

Reproducer: exhaust fd table near RLIMIT_NOFILE, then repeatedly call
IOMMU_TEST_OP_DMABUF_GET — htop shows unbounded memory growth.

Fix by calling dma_buf_put(dmabuf) on error and returning directly.

Fixes: d2041f1f11 ("iommufd/selftest: Add some tests for the dmabuf flow")
Link: https://patch.msgid.link/r/20260707030635.221577-1-seven.yi.lee@gmail.com
Signed-off-by: yeeli <seven.yi.lee@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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yeeli 2026-07-07 11:06:35 +08:00 • committed by Jason Gunthorpe

parent 4132ba2ae2

commit dba4254e21

1 changed files with 6 additions and 1 deletions

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drivers/iommu/iommufd/selftest.c

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