[sync] PR-761: net: stmmac: fix potential double free of dma descriptor resources · Pull Request !812 · openEuler/kernel

### 1. Origin pull request:
https://gitee.com/openeuler/kernel/pulls/761

### 2. Original pull request related issue(s):
https://gitee.com/openeuler/kernel/issues/I733VA

### 3. Original pull request related commit(s):
| Sha | Datetime | Message |
|---|---|---|
|[47021bed](https://gitee.com/openeuler/kernel/commits/47021bede1746087380bd27ecc7b4d0995f997ca)|2023-05-08 16:18:12 +0800 CST|net: stmmac: fix potential double free of dma descriptor resources LoongArch inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I733VA -------------------------------- reset the dma descriptor related resource's pointer to NULL,otherwise a potential double free problem may be triggered: stmmac_open alloc_dma_desc_resources init_dma_desc_rings stmmac_hw_setup (Failed) goto init_error; free_dma_desc_resources(priv); (DMA related resource pointer not reset to NULL) ... stmmac_open alloc_dma_desc_resources alloc_dma_tx_desc_resources (Failed) free_dma_tx_desc_resources (Double free of tx_q->tx_skbuff_dma tx_q->tx_skbuff) Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn> Change-Id: Ie917b7402e86cbd1b253553c10ac4a5440e38c03 |

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