From a19428e5c3f4f39c302cb97b847dfd23613145c1 Mon Sep 17 00:00:00 2001 From: Chen Gang Date: Mon, 27 Jan 2014 17:07:13 -0800 Subject: kernel/kexec.c: use vscnprintf() instead of vsnprintf() in vmcoreinfo_append_str() vsnprintf() may let 'r' larger than sizeof(buf), in this case, if 'r' is also less than "vmcoreinfo_max_size - vmcoreinfo_size" (left size of destination buffer), next memcpy() will read the unexpected addresses. Signed-off-by: Chen Gang Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/kexec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel/kexec.c') diff --git a/kernel/kexec.c b/kernel/kexec.c index ac738781d356..60bafbed06ab 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1537,7 +1537,7 @@ void vmcoreinfo_append_str(const char *fmt, ...) size_t r; va_start(args, fmt); - r = vsnprintf(buf, sizeof(buf), fmt, args); + r = vscnprintf(buf, sizeof(buf), fmt, args); va_end(args); r = min(r, vmcoreinfo_max_size - vmcoreinfo_size); -- cgit