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msm: camera: icp: Protect icp context access at time of pagefault

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Take mutex before acessing icp context to prevent improper free.

Change-Id: If2fd2c66dd9a00f1ab5c9ec1710573c2921dce6a
Signed-off-by: Prakasha Nayak <pnayak@codeaurora.org>
This commit is contained in:
Jigarkumar Zala 2019-06-19 12:17:30 -07:00 • committed by Gerrit - the friendly Code Review server
commit 657d77d87d
1 changed files with 10 additions and 0 deletions
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10
drivers/cam_icp/cam_icp_context.c
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@ -37,6 +37,14 @@ static int cam_icp_context_dump_active_request(void *data, unsigned long iova,
return -EINVAL;
}
mutex_lock(&ctx->ctx_mutex);
if (ctx->state < CAM_CTX_ACQUIRED || ctx->state > CAM_CTX_ACTIVATED) {
CAM_ERR(CAM_ICP, "Invalid state icp ctx %d state %d",
ctx->ctx_id, ctx->state);
goto end;
}
CAM_INFO(CAM_ICP, "iommu fault for icp ctx %d state %d",
ctx->ctx_id, ctx->state);
@ -55,6 +63,8 @@ static int cam_icp_context_dump_active_request(void *data, unsigned long iova,
req->request_id, rc);
}
end:
mutex_unlock(&ctx->ctx_mutex);
return rc;
}