Correctly compute consumed bytes in case of truncated byte sequence at end.

1 files changed, 8 insertions, 0 deletions

diff --git a/generic/tclEncoding.c b/generic/tclEncoding.c
index d0f04a7..42fcb7f 100644
--- a/generic/tclEncoding.c
+++ b/generic/tclEncoding.c
@@ -3448,6 +3448,14 @@ TableToUtfProc(
 	src++;
     }
 
+    if (src > srcEnd) {
+        /*
+         * This can happen in the case of a trailing truncated byte sequence
+         * where src is incremented past the prefix byte which is the last.
+         * See bug [5be203d6ca]
+         */
+        src--;
+    }
     *srcReadPtr = src - srcStart;
     *dstWrotePtr = dst - dstStart;
     *dstCharsPtr = numChars;