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misc: fastrpc: Unmap only if buffer is unmapped from DSP

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For unmapping any buffer from kernel, it should first be unmapped
from DSP. In case unmap from DSP request fails, the map should not
be removed from kernel as it might lead to SMMU faults and other
memory issues.

Fixes: 5c1b97c7d7 ("misc: fastrpc: add support for FASTRPC_IOCTL_MEM_MAP/UNMAP")
Cc: stable <stable@kernel.org>
Signed-off-by: Ekansh Gupta <quic_ekangupt@quicinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20231013122007.174464-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ekansh Gupta 2023-10-13 13:20:07 +01:00 committed by Greg Kroah-Hartman
parent 1c8093591d
commit 509143385d
1 changed files with 5 additions and 3 deletions
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8
drivers/misc/fastrpc.c
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@ -1981,11 +1981,13 @@ static int fastrpc_req_mem_unmap_impl(struct fastrpc_user *fl, struct fastrpc_me
sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_UNMAP, 1, 0);
err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
&args[0]);
fastrpc_map_put(map);
if (err)
if (err) {
dev_err(dev, "unmmap\tpt fd = %d, 0x%09llx error\n", map->fd, map->raddr);
return err;
}
fastrpc_map_put(map);
return err;
return 0;
}
static int fastrpc_req_mem_unmap(struct fastrpc_user *fl, char __user *argp)