tracemalloc: fix usage of strtol(), value can be LONG_MIN or LONG_MAX on ERANGE

diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
index 7e6113dc1ae20596b5afd513256c3991c887894e..f8ce76625181c45b0e2bd2111440ac75356e1c56 100644 (file)
--- a/Modules/_tracemalloc.c
+++ b/Modules/_tracemalloc.c
@@ -1373,11 +1373,12 @@ _PyTraceMalloc_Init(void)
         char *endptr = p;
         long value;
 
+        errno = 0;
         value = strtol(p, &endptr, 10);
         if (*endptr != '\0'
             || value < 1
             || value > MAX_NFRAME
-            || (errno == ERANGE && value == ULONG_MAX))
+            || errno == ERANGE)
         {
             Py_FatalError("PYTHONTRACEMALLOC: invalid number of frames");
             return -1;