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misc: fastrpc: fix DMA address corruption due to find_vma misuse

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fastrpc_get_args() uses find_vma() to look up the VMA for a user-provided
pointer and compute a DMA address offset. When the address falls in a gap
before the returned VMA, (ptr & PAGE_MASK) - vma->vm_start underflows,
corrupting the DMA address sent to the DSP.

Replace find_vma() with vma_lookup(), which returns NULL when the address
is not contained within any VMA.

Cc: stable@vger.kernel.org
Fixes: 80f3afd72b ("misc: fastrpc: consider address offset before sending to DSP")
Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://patch.msgid.link/20260530204528.116920-3-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Junrui Luo 2026-05-30 21:45:26 +01:00 committed by Greg Kroah-Hartman
parent e85eb5feca
commit 464c6ad2aa
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/fastrpc.c
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@ -1090,7 +1090,7 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
pages[i].addr = ctx->maps[i]->dma_addr;
mmap_read_lock(current->mm);
vma = find_vma(current->mm, ctx->args[i].ptr);
vma = vma_lookup(current->mm, ctx->args[i].ptr);
if (vma)
pages[i].addr += (ctx->args[i].ptr & PAGE_MASK) -
vma->vm_start;