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RDMA/ucma: Fix resource leak on error path

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In ucma_process_join(), if the call to xa_alloc() fails, the function will
return without freeing mc. Fix this by jumping to the correct line.

In the process I renamed the jump labels to something more memorable for
extra clarity.

Link: https://lore.kernel.org/r/20200902162454.332828-1-alex.dewar90@gmail.com
Addresses-Coverity-ID: 1496814 ("Resource leak")
Fixes: 95fe51096b ("RDMA/ucma: Remove mc_list and rely on xarray")
Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Alex Dewar 2020-09-02 17:24:51 +01:00 committed by Jason Gunthorpe
parent 7d11b4787d
commit 4f680cb9f1
1 changed files with 8 additions and 7 deletions
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15
drivers/infiniband/core/ucma.c
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@ -1453,7 +1453,7 @@ static ssize_t ucma_process_join(struct ucma_file *file,
mc = kzalloc(sizeof(*mc), GFP_KERNEL);
if (!mc) {
ret = -ENOMEM;
goto err1;
goto err_put_ctx;
}
mc->ctx = ctx;
@ -1464,7 +1464,7 @@ static ssize_t ucma_process_join(struct ucma_file *file,
if (xa_alloc(&multicast_table, &mc->id, NULL, xa_limit_32b,
GFP_KERNEL)) {
ret = -ENOMEM;
goto err1;
goto err_free_mc;
}
mutex_lock(&ctx->mutex);
@ -1472,13 +1472,13 @@ static ssize_t ucma_process_join(struct ucma_file *file,
join_state, mc);
mutex_unlock(&ctx->mutex);
if (ret)
goto err2;
goto err_xa_erase;
resp.id = mc->id;
if (copy_to_user(u64_to_user_ptr(cmd->response),
&resp, sizeof(resp))) {
ret = -EFAULT;
goto err3;
goto err_leave_multicast;
}
xa_store(&multicast_table, mc->id, mc, 0);
@ -1486,15 +1486,16 @@ static ssize_t ucma_process_join(struct ucma_file *file,
ucma_put_ctx(ctx);
return 0;
err3:
err_leave_multicast:
mutex_lock(&ctx->mutex);
rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
mutex_unlock(&ctx->mutex);
ucma_cleanup_mc_events(mc);
err2:
err_xa_erase:
xa_erase(&multicast_table, mc->id);
err_free_mc:
kfree(mc);
err1:
err_put_ctx:
ucma_put_ctx(ctx);
return ret;
}