CVE-2024-50001
net/mlx5: Fix error path in multi-packet WQE transmit
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net/mlx5: Fix error path in multi-packet WQE transmit
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix error path in multi-packet WQE transmit Remove the erroneous unmap in case no DMA mapping was established The multi-packet WQE transmit code attempts to obtain a DMA mapping for the skb. This could fail, e.g. under memory pressure, when the IOMMU driver just can't allocate more memory for page tables. While the code tries to handle this in the path below the err_unmap label it erroneously unmaps one entry from the sq's FIFO list of active mappings. Since the current map attempt failed this unmap is removing some random DMA mapping that might still be required. If the PCI function now presents that IOVA, the IOMMU may assumes a rogue DMA access and e.g. on s390 puts the PCI function in error state. The erroneous behavior was seen in a stress-test environment that created memory pressure.
Reserved 2024-10-21 | Published 2024-10-21 | Updated 2025-05-04 | Assigner Linuxgit.kernel.org/...c/ca36d6c1a49b6965c86dd528a73f38bc62d9c625
git.kernel.org/...c/ce828b347cf1b3c1b12b091d02463c35ce5097f5
git.kernel.org/...c/fc357e78176945ca7bcacf92ab794b9ccd41b4f4
git.kernel.org/...c/26fad69b34fcba80d5c7d9e651f628e6ac927754
git.kernel.org/...c/ecf310aaf256acbc8182189fe0aa1021c3ddef72
git.kernel.org/...c/8bb8c12fb5e2b1f03d603d493c92941676f109b5
git.kernel.org/...c/2bcae12c795f32ddfbf8c80d1b5f1d3286341c32
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