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-rw-r--r--lisp/ChangeLog4
-rw-r--r--lisp/image.el3
2 files changed, 6 insertions, 1 deletions
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 495fc5fa36e..334d3bd462e 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2003-08-26 John Paul Wallington <jpw@gnu.org>
+
+ * image.el (image-jpeg-p): Don't search beyond length of data.
+
2003-08-26 Martin Stjernholm <bug-cc-mode@gnu.org>
* progmodes/cc-cmds.el (c-electric-brace): Work around for a
diff --git a/lisp/image.el b/lisp/image.el
index 25d05c9902f..5f603ccdd12 100644
--- a/lisp/image.el
+++ b/lisp/image.el
@@ -67,7 +67,8 @@ We accept the tag Exif because that is the same format."
(when (and (>= code #xe0) (<= code #xef))
;; APP0 LEN1 LEN2 "JFIF\0"
(throw 'jfif
- (string-match "JFIF\\|Exif" (substring data i (+ i nbytes)))))
+ (string-match "JFIF\\|Exif"
+ (substring data i (min (+ i nbytes) len)))))
(setq i (+ i 1 nbytes))))))))