Vulnerability details

In the Linux kernel, the following vulnerability has been resolved: drm/gpusvm: publish dpagemap early to avoid device mapping leak on error drm_gpusvm_get_pages() only stored the local dpagemap into svm_pages->dpagemap on the success path. If a later page failed (e.g. -EOPNOTSUPP when ctx->allow_mixed is false) and jumped to err_unmap, svm_pages->dpagemap was still NULL, so __drm_gpusvm_unmap_pages() skipped device_unmap() and leaked the device mappings already created. Assign svm_pages->dpagemap when the first device page is mapped so the err_unmap path can device_unmap() those mappings. This issue was found by Sashiko AI review.

• https://git.kernel.org/stable/c/e8362523fd1b61712f7d996802f9b5dee545c7e6
• https://git.kernel.org/stable/c/72e4fca5529e45b5beebad79d804de442f632324
• https://git.kernel.org/stable/c/7f708f51e3955bda0d77a0b67ab9bea6c97fea99