| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49569: spi: bcm2835: bcm2835_spi_handle_err(): fix NULL pointer deref for non DMA transfers |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| spi: bcm2835: bcm2835_spi_handle_err(): fix NULL pointer deref for non DMA transfers |
| |
| In case a IRQ based transfer times out the bcm2835_spi_handle_err() |
| function is called. Since commit 1513ceee70f2 ("spi: bcm2835: Drop |
| dma_pending flag") the TX and RX DMA transfers are unconditionally |
| canceled, leading to NULL pointer derefs if ctlr->dma_tx or |
| ctlr->dma_rx are not set. |
| |
| Fix the NULL pointer deref by checking that ctlr->dma_tx and |
| ctlr->dma_rx are valid pointers before accessing them. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49569 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4 with commit 1513ceee70f2bd523e025efe0c715328e1a43ffd and fixed in 5.4.208 with commit 76668d2a2f367d25ff448e6d7087406af7d7bb2b |
| Issue introduced in 5.4 with commit 1513ceee70f2bd523e025efe0c715328e1a43ffd and fixed in 5.10.134 with commit 684896e675edd8b669fd3e9f547c5038222d85bc |
| Issue introduced in 5.4 with commit 1513ceee70f2bd523e025efe0c715328e1a43ffd and fixed in 5.15.58 with commit 58466e05390043d2805685c70f55f3f59711bdf2 |
| Issue introduced in 5.4 with commit 1513ceee70f2bd523e025efe0c715328e1a43ffd and fixed in 5.18.15 with commit 49ffa473218012e765682343de2052eb4c1f06a7 |
| Issue introduced in 5.4 with commit 1513ceee70f2bd523e025efe0c715328e1a43ffd and fixed in 5.19 with commit 4ceaa684459d414992acbefb4e4c31f2dfc50641 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49569 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/spi/spi-bcm2835.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/76668d2a2f367d25ff448e6d7087406af7d7bb2b |
| https://git.kernel.org/stable/c/684896e675edd8b669fd3e9f547c5038222d85bc |
| https://git.kernel.org/stable/c/58466e05390043d2805685c70f55f3f59711bdf2 |
| https://git.kernel.org/stable/c/49ffa473218012e765682343de2052eb4c1f06a7 |
| https://git.kernel.org/stable/c/4ceaa684459d414992acbefb4e4c31f2dfc50641 |
