CVE-2024-26787

In the Linux kernel, the following vulnerability has been resolved:

mmc: mmci: stm32: fix DMA API overlapping mappings warning

Turning on CONFIGDMAAPIDEBUGSG results in the following warning:

DMA-API: mmci-pl18x 48220000.mmc: cacheline tracking EEXIST, overlapping mappings aren't supported WARNING: CPU: 1 PID: 51 at kernel/dma/debug.c:568 adddmaentry+0x234/0x2f4 Modules linked in: CPU: 1 PID: 51 Comm: kworker/1:2 Not tainted 6.1.28 #1 Hardware name: STMicroelectronics STM32MP257F-EV1 Evaluation Board (DT) Workqueue: eventsfreezable mmcrescan Call trace: adddmaentry+0x234/0x2f4 debugdmamapsg+0x198/0x350 _dmamapsgattrs+0xa0/0x110 dmamapsgattrs+0x10/0x2c sdmmcidmaprepdata+0x80/0xc0 mmciprepdata+0x38/0x84 mmcistartdata+0x108/0x2dc mmcirequest+0xe4/0x190 _mmcstartrequest+0x68/0x140 mmcstartrequest+0x94/0xc0 mmcwaitforreq+0x70/0x100 mmcsendtuning+0x108/0x1ac sdmmcexecutetuning+0x14c/0x210 mmcexecutetuning+0x48/0xec mmcsdinituhscard.part.0+0x208/0x464 mmcsdinitcard+0x318/0x89c mmcattachsd+0xe4/0x180 mmcrescan+0x244/0x320

DMA API debug brings to light leaking dma-mappings as dmamapsg and dmaunmapsg are not correctly balanced.

If an error occurs in mmcicmdirq function, only mmcidmaerror function is called and as this API is not managed on stm32 variant, dmaunmapsg is never called in this error path.