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dsp: avtimer: validate payload size before memory copy

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Check payload size to avoid out-of-boundary memory
access before attemptimg memory read.

Change-Id: Id22f5c4e50c788053a0529e2d252e497991e1a38
Signed-off-by: Soumya Managoli <smanag@codeaurora.org>
[haggertk: Backport to 3.4/msm8974. Path change.]
CVE-2019-10626
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
This commit is contained in:
Soumya Managoli
2020-08-08 16:42:21 +02:00
committed by matteo0026
parent a16d6068bc
commit 29438f7684
1 changed files with 13 additions and 1 deletions
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drivers/platform/msm/avtimer.c
+13 -1
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@@ -1,4 +1,4 @@
/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
/* Copyright (c) 2012-2016, 2019, The Linux Foundation. All rights reserved.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -93,6 +93,13 @@ static int32_t aprv2_core_fn_q(struct apr_client_data *data, void *priv)
}
payload1 = data->payload;
if (data->payload_size < 2 * sizeof(uint32_t)) {
pr_err("%s: payload has invalid size %d\n",
__func__, data->payload_size);
return -EINVAL;
}
switch (payload1[0]) {
case AVCS_CMD_REMOTE_AVTIMER_RELEASE_REQUEST:
pr_debug("%s: Cmd = TIMER RELEASE status[0x%x]\n",
@@ -118,6 +125,11 @@ static int32_t aprv2_core_fn_q(struct apr_client_data *data, void *priv)
}
case AVCS_CMD_RSP_REMOTE_AVTIMER_VOTE_REQUEST:
if (data->payload_size < sizeof(uint32_t)) {
pr_err("%s: payload has invalid size %d\n",
__func__, data->payload_size);
return -EINVAL;
}
payload1 = data->payload;
pr_debug("%s: RSP_REMOTE_AVTIMER_VOTE_REQUEST handle %x\n",
__func__, payload1[0]);