Changelog.

Merge pull request #89 from vlasovsoft1979/master
Fix undefined behavior in _pdfioFileSeek
2025-04-06 17:06:45 +02:00 · 2025-01-18 09:45:29 -05:00 · 2025-01-18 09:42:58 -05:00 · 2025-01-18 13:56:25 +03:00
2 changed files with 2 additions and 1 deletions
--- a/CHANGES.md
+++ b/CHANGES.md
@ -8,6 +8,7 @@ v1.4.1 - YYYY-MM-DD
 - Fixed the link libraries for the example source code (Issue #86)
 - Fixed handling of the Info object (Issue #87)
 - Fixed opening of PDF files less than 1024 bytes in length (Issue #87)
+- Fixed potential `NULL` dereference when reading (Issue #89)


 v1.4.0 - 2024-12-26
--- a/pdfio-common.c
+++ b/pdfio-common.c
@ -368,7 +368,7 @@ _pdfioFileSeek(pdfio_file_t *pdf,	// I - PDF file
  if (pdf->mode == _PDFIO_MODE_READ)
  {
    // Reading, see if we already have the data we need...
-    if (whence != SEEK_END && offset >= pdf->bufpos && offset < (pdf->bufpos + pdf->bufend - pdf->buffer))
+    if (whence != SEEK_END && offset >= pdf->bufpos && pdf->bufend && offset < (pdf->bufpos + pdf->bufend - pdf->buffer))
    {
      // Yes, seek within existing buffer...
      pdf->bufptr = pdf->buffer + (offset - pdf->bufpos);
Author	SHA1	Message	Date
Michael R Sweet	41ac7a0b4b	Changelog.	2025-01-18 09:45:29 -05:00
Michael R Sweet	5fc571b711	Merge pull request #89 from vlasovsoft1979/master Fix undefined behavior in _pdfioFileSeek	2025-01-18 09:42:58 -05:00
Sergey Vlasov	acf27d29c6	Fix undefined behavior	2025-01-18 13:56:25 +03:00