iommufd/selftest: Fix dmabuf leak in iommufd_test_dmabuf_get()

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: d2041f1f11dd ("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>

0 files changed, 0 insertions, 0 deletions