lib/vsprintf.c: fix handling of %zd when using ssize_t

Documentation/printk-formats.txt says to use %zd for a ssize_t argument
and some drivers do.  Unfortunately this prints a positive number for
negative values eg:

  tpm_tis 70030000.tpm_tis: tpm_transmit: tpm_send: error 4294967234

Add a case to va_args a ssize_t type if the interpretation should be
signed.

Tested on PPC32.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 39c99fea7c03..41da0741a663 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1485,7 +1485,10 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
                                 num = va_arg(args, long);
                                 break;
                         case FORMAT_TYPE_SIZE_T:
-                                num = va_arg(args, size_t);
+                                if (spec.flags & SIGN)
+                                        num = va_arg(args, ssize_t);
+                                else
+                                        num = va_arg(args, size_t);
                                 break;
                         case FORMAT_TYPE_PTRDIFF:
                                 num = va_arg(args, ptrdiff_t);