diff options
| author | Tomer Tayar <ttayar@habana.ai> | 2022-12-15 15:36:53 +0100 |
|---|---|---|
| committer | Oded Gabbay <ogabbay@kernel.org> | 2023-01-26 09:56:22 +0100 |
| commit | 9b3d9f917f81aed559d19377c11d6fac3db89fd7 (patch) | |
| tree | 640657ae7bdd2acda6b1130687db481c2cac0208 /drivers/misc | |
| parent | habanalabs/gaudi2: dump event description even if no cause (diff) | |
| download | linux-9b3d9f917f81aed559d19377c11d6fac3db89fd7.tar.xz linux-9b3d9f917f81aed559d19377c11d6fac3db89fd7.zip | |
habanalabs: fix dma-buf release handling if dma_buf_fd() fails
The dma-buf private object is freed if a call to dma_buf_fd() fails,
and because a file was already associated with the dma-buf in
dma_buf_export(), the release op will be called and will use this
object.
Mark the 'priv' field as NULL in this case, and avoid accessing it from
the release op.
Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/habanalabs/common/memory.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c index 693456366753..a2d24c9a3d1e 100644 --- a/drivers/misc/habanalabs/common/memory.c +++ b/drivers/misc/habanalabs/common/memory.c @@ -1782,7 +1782,12 @@ static void hl_unmap_dmabuf(struct dma_buf_attachment *attachment, static void hl_release_dmabuf(struct dma_buf *dmabuf) { struct hl_dmabuf_priv *hl_dmabuf = dmabuf->priv; - struct hl_ctx *ctx = hl_dmabuf->ctx; + struct hl_ctx *ctx; + + if (!hl_dmabuf) + return; + + ctx = hl_dmabuf->ctx; if (hl_dmabuf->memhash_hnode) { mutex_lock(&ctx->mem_hash_lock); @@ -1822,7 +1827,7 @@ static int export_dmabuf(struct hl_ctx *ctx, fd = dma_buf_fd(hl_dmabuf->dmabuf, flags); if (fd < 0) { - dev_err(hdev->dev, "failed to get a file descriptor for a dma-buf\n"); + dev_err(hdev->dev, "failed to get a file descriptor for a dma-buf, %d\n", fd); rc = fd; goto err_dma_buf_put; } @@ -1835,6 +1840,7 @@ static int export_dmabuf(struct hl_ctx *ctx, return 0; err_dma_buf_put: + hl_dmabuf->dmabuf->priv = NULL; dma_buf_put(hl_dmabuf->dmabuf); return rc; } |