CVE ID:	CVE-2021-47586
Description:	In the Linux kernel, the following vulnerability has been resolved: net: stmmac: dwmac-rk: fix oob read in rk_gmac_setup KASAN reports an out-of-bounds read in rk_gmac_setup on the line: while (ops->regs[i]) { This happens for most platforms since the regs flexible array member is empty, so the memory after the ops structure is being read here. It seems that mostly this happens to contain zero anyway, so we get lucky and everything still works. To avoid adding redundant data to nearly all the ops structures, add a new flag to indicate whether the regs field is valid and avoid this loop when it is not.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-47586 https://git.kernel.org/stable/c/0546b224cc7717cc8a2db076b0bb069a9c430794 https://git.kernel.org/stable/c/0546b224cc7717cc8a2db076b0bb069a9c430794 https://git.kernel.org/stable/c/0b4a5d1e15ce72f69be48f38dc0401dab890ae0f https://git.kernel.org/stable/c/0b4a5d1e15ce72f69be48f38dc0401dab890ae0f