ubifs: wbuf: Don't leak kernel memory to flash
commit 20f14311 upstream Write buffers use a kmalloc()'ed buffer, they can leak up to seven bytes of kernel memory to flash if writes are not aligned. So use ubifs_pad() to fill these gaps with padding bytes. This was never a problem while scanning because the scanner logic manually aligns node lengths and skips over these gaps. Cc: <stable@vger.kernel.org> Fixes: 1e51764a ("UBIFS: add new flash file system") Signed-off-by:Richard Weinberger <richard@nod.at> Reviewed-by:
Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by:
Richard Weinberger <richard@nod.at> [sudip: adjust context] Signed-off-by:
Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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