[dpdk-dev] [PATCH v2] eal/windows: fix out-of-memory check

[Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>]

Check vsnprintf() result to prevent calling malloc() with negative size.
Check actual malloc() result and terminate asprintf() with documented
error code to prevent the use of NULL pointer.

Fixes: e8428a9d8 ("eal/windows: add some basic functions and macros")

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
---
 lib/librte_eal/windows/eal/include/rte_os.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

v2 Changes:
    Check vsnprintf() value before appending place for '\0'.

diff --git a/lib/librte_eal/windows/eal/include/rte_os.h b/lib/librte_eal/windows/eal/include/rte_os.h
index 9e762617b..c76be1216 100644
--- a/lib/librte_eal/windows/eal/include/rte_os.h
+++ b/lib/librte_eal/windows/eal/include/rte_os.h
@@ -64,12 +64,15 @@ asprintf(char **buffer, const char *format, ...)
 	va_list arg;
 
 	va_start(arg, format);
-	size = vsnprintf(NULL, 0, format, arg) + 1;
+	size = vsnprintf(NULL, 0, format, arg);
 	va_end(arg);
+	if (size < 0)
+		return -1;
+	size++;
 
 	*buffer = malloc(size);
-	if (buffer == NULL)
-		printf("Cannot allocate memory");
+	if (*buffer == NULL)
+		return -1;
 
 	va_start(arg, format);
 	ret = vsnprintf(*buffer, size, format, arg);
-- 
2.25.0