[libc-commits] [libc] cc65ecf - [libc] fix strtofloat on large exponents

Michael Jones via libc-commits libc-commits at lists.llvm.org
Wed Apr 5 09:58:36 PDT 2023


Author: Michael Jones
Date: 2023-04-05T09:58:31-07:00
New Revision: cc65ecfd08fbcd1dbfa21532830877460432b4da

URL: https://github.com/llvm/llvm-project/commit/cc65ecfd08fbcd1dbfa21532830877460432b4da
DIFF: https://github.com/llvm/llvm-project/commit/cc65ecfd08fbcd1dbfa21532830877460432b4da.diff

LOG: [libc] fix strtofloat on large exponents

Previously if you specified an exponent of more than 10000 in string to
float (e.g. "1e10001") it would treat it as 10000. A bug was discovered
where by having more than 10000 zeroes after a decimal point and an
exponent of more than 10000 this would cause the code to return the
incorrect value.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D147474

Added: 
    

Modified: 
    libc/src/__support/str_to_float.h
    libc/test/src/stdlib/strtod_test.cpp

Removed: 
    


################################################################################
diff  --git a/libc/src/__support/str_to_float.h b/libc/src/__support/str_to_float.h
index dc8c3cb22ef38..9ba0602eb5767 100644
--- a/libc/src/__support/str_to_float.h
+++ b/libc/src/__support/str_to_float.h
@@ -935,13 +935,22 @@ decimal_string_to_float(const char *__restrict src, const char DECIMAL_POINT,
       if (result.has_error())
         output.error = result.error;
       int32_t add_to_exponent = result.value;
-      if (add_to_exponent > 100000)
-        add_to_exponent = 100000;
-      else if (add_to_exponent < -100000)
-        add_to_exponent = -100000;
-
       index += result.parsed_len;
-      exponent += add_to_exponent;
+
+      // Here we do this operation as int64 to avoid overflow.
+      int64_t temp_exponent = static_cast<int64_t>(exponent) +
+                              static_cast<int64_t>(add_to_exponent);
+
+      // If the result is in the valid range, then we use it. The valid range is
+      // also within the int32 range, so this prevents overflow issues.
+      if (temp_exponent < fputil::FPBits<T>::MAX_EXPONENT &&
+          temp_exponent > -fputil::FPBits<T>::MAX_EXPONENT) {
+        exponent = static_cast<int32_t>(temp_exponent);
+      } else if (temp_exponent > fputil::FPBits<T>::MAX_EXPONENT) {
+        exponent = fputil::FPBits<T>::MAX_EXPONENT;
+      } else {
+        exponent = -fputil::FPBits<T>::MAX_EXPONENT;
+      }
     }
   }
 
@@ -1036,12 +1045,22 @@ hexadecimal_string_to_float(const char *__restrict src,
         output.error = result.error;
 
       int32_t add_to_exponent = result.value;
-      if (add_to_exponent > 100000)
-        add_to_exponent = 100000;
-      else if (add_to_exponent < -100000)
-        add_to_exponent = -100000;
       index += result.parsed_len;
-      exponent += add_to_exponent;
+
+      // Here we do this operation as int64 to avoid overflow.
+      int64_t temp_exponent = static_cast<int64_t>(exponent) +
+                              static_cast<int64_t>(add_to_exponent);
+
+      // If the result is in the valid range, then we use it. The valid range is
+      // also within the int32 range, so this prevents overflow issues.
+      if (temp_exponent < fputil::FPBits<T>::MAX_EXPONENT &&
+          temp_exponent > -fputil::FPBits<T>::MAX_EXPONENT) {
+        exponent = static_cast<int32_t>(temp_exponent);
+      } else if (temp_exponent > fputil::FPBits<T>::MAX_EXPONENT) {
+        exponent = fputil::FPBits<T>::MAX_EXPONENT;
+      } else {
+        exponent = -fputil::FPBits<T>::MAX_EXPONENT;
+      }
     }
   }
   output.parsed_len = index;

diff  --git a/libc/test/src/stdlib/strtod_test.cpp b/libc/test/src/stdlib/strtod_test.cpp
index 779c810f72083..4eb1f49062dd0 100644
--- a/libc/test/src/stdlib/strtod_test.cpp
+++ b/libc/test/src/stdlib/strtod_test.cpp
@@ -196,4 +196,357 @@ TEST_F(LlvmLibcStrToDTest, FuzzFailures) {
   // with this result, but ours is correct for the nearest rounding mode. See
   // this bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30220
   run_test("0x30000002222225p-1077", 22, uint64_t(0x0006000000444445), ERANGE);
+
+  // This bug was in the handling of very large exponents in the exponent
+  // marker. Previously anything greater than 10,000 would be set to 10,000.
+  // This caused incorrect behavior if there were more than 10,000 '0's in the
+  // input number, and then a correspondingly large exponent. This test case has
+  // 24,744 zeroes.
+  run_test(
+      "0x."
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 }


        


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