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Driver is capable of handling only one request at a time and it stores it in its state container struct s5p_aes_dev. This stored request must be protected between concurrent invocations (e.g. completing current request and scheduling new one). Combination of lock and "busy" field is used for that purpose. When "busy" field is true, the driver will not accept new request thus it will not overwrite currently handled data. However commit28b62b1458("crypto: s5p-sss - Fix spinlock recursion on LRW(AES)") moved some of the write to "busy" field out of a lock protected critical section. This might lead to potential race between completing current request and scheduling a new one. Effectively the request completion might try to operate on new crypto request. Cc: <stable@vger.kernel.org> # v4.10.x Fixes:28b62b1458("crypto: s5p-sss - Fix spinlock recursion on LRW(AES)") Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.