LZWDecode(): avoid crash when trying to read again from a strip whith a missing end-of-information marker (fixes #548)

1 files changed, 5 insertions, 0 deletions

diff --git a/libtiff/tif_lzw.c b/libtiff/tif_lzw.c
index ba75a07e..d631fa10 100644
--- a/libtiff/tif_lzw.c
+++ b/libtiff/tif_lzw.c
@@ -423,6 +423,10 @@ static int LZWDecode(TIFF *tif, uint8_t *op0, tmsize_t occ0, uint16_t s)
 
     if (sp->read_error)
     {
+        TIFFErrorExtR(tif, module,
+                      "LZWDecode: Scanline %" PRIu32 " cannot be read due to "
+                      "previous error",
+                      tif->tif_row);
         return 0;
     }
 
@@ -742,6 +746,7 @@ after_loop:
     return (1);
 
 no_eoi:
+    sp->read_error = 1;
     TIFFErrorExtR(tif, module,
                   "LZWDecode: Strip %" PRIu32 " not terminated with EOI code",
                   tif->tif_curstrip);