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 <gang.chen@asianux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/kexec.c b/kernel/kexec.c
index ac73878..60bafbe 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1537,7 +1537,7 @@
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);