X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Freadwrite.c;h=d33e0519088049bdb4895198d167d872522d9671;hb=636ae5db984a5e01e2c148b5bea5306f84258f8e;hp=7b8460962eda5ee7e917be20cce7c47be0a56ea4;hpb=6d574024f868e661ae688ecbc47a110a1311c57e;p=lttng-tools.git

diff --git a/src/common/readwrite.c b/src/common/readwrite.c
index 7b8460962..d33e05190 100644
--- a/src/common/readwrite.c
+++ b/src/common/readwrite.c
@@ -17,6 +17,7 @@
 
 #include <assert.h>
 #include <errno.h>
+#include <limits.h>
 #include <unistd.h>
 
 #include "readwrite.h"
@@ -36,6 +37,14 @@ ssize_t lttng_read(int fd, void *buf, size_t count)
 
 	assert(buf);
 
+	/*
+	 * Deny a read count that can be bigger then the returned value max size.
+	 * This makes the function to never return an overflow value.
+	 */
+	if (count > SSIZE_MAX) {
+		return -EINVAL;
+	}
+
 	do {
 		ret = read(fd, buf + i, count - i);
 		if (ret < 0) {
@@ -65,6 +74,14 @@ ssize_t lttng_write(int fd, const void *buf, size_t count)
 
 	assert(buf);
 
+	/*
+	 * Deny a write count that can be bigger then the returned value max size.
+	 * This makes the function to never return an overflow value.
+	 */
+	if (count > SSIZE_MAX) {
+		return -EINVAL;
+	}
+
 	do {
 		ret = write(fd, buf + i, count - i);
 		if (ret < 0) {