[libcamera-devel] [RFC PATCH v2 11/14] libcamera: yaml_parser: Fix range checks for 32-bit integers

[Laurent Pinchart]

The strtol() and strtoul() functions return long integers, which may be
larger than 32-bit integers. Add manual range checks.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 src/libcamera/yaml_parser.cpp | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/libcamera/yaml_parser.cpp b/src/libcamera/yaml_parser.cpp
index 97104ac118a8..3fb6fec695ee 100644
--- a/src/libcamera/yaml_parser.cpp
+++ b/src/libcamera/yaml_parser.cpp
@@ -10,6 +10,7 @@
 #include <cstdlib>
 #include <errno.h>
 #include <functional>
+#include <limits>
 
 #include <libcamera/base/file.h>
 #include <libcamera/base/log.h>
@@ -150,9 +151,11 @@ int32_t YamlObject::get(const int32_t &defaultValue, bool *ok) const
 	char *end;
 
 	errno = 0;
-	int32_t value = std::strtol(value_.c_str(), &end, 10);
+	long value = std::strtol(value_.c_str(), &end, 10);
 
-	if ('\0' != *end || errno == ERANGE)
+	if ('\0' != *end || errno == ERANGE ||
+	    value < std::numeric_limits<int32_t>::min() ||
+	    value > std::numeric_limits<int32_t>::max())
 		return defaultValue;
 
 	setOk(ok, true);
@@ -184,9 +187,11 @@ uint32_t YamlObject::get(const uint32_t &defaultValue, bool *ok) const
 	char *end;
 
 	errno = 0;
-	uint32_t value = std::strtoul(value_.c_str(), &end, 10);
+	unsigned long value = std::strtoul(value_.c_str(), &end, 10);
 
-	if ('\0' != *end || errno == ERANGE)
+	if ('\0' != *end || errno == ERANGE ||
+	    value < std::numeric_limits<uint32_t>::min() ||
+	    value > std::numeric_limits<uint32_t>::max())
 		return defaultValue;
 
 	setOk(ok, true);
-- 
Regards,

Laurent Pinchart