diff options
Diffstat (limited to 'generic/tkImgGIF.c')
| -rw-r--r-- | generic/tkImgGIF.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/generic/tkImgGIF.c b/generic/tkImgGIF.c index 6273c69..fbfe621 100644 --- a/generic/tkImgGIF.c +++ b/generic/tkImgGIF.c @@ -393,7 +393,8 @@ FileReadGIF( * image being read. */ { int fileWidth, fileHeight, imageWidth, imageHeight; - int nBytes, index = 0, argc = 0, i, result = TCL_ERROR; + unsigned int nBytes; + int index = 0, argc = 0, i, result = TCL_ERROR; Tcl_Obj **objv; unsigned char buf[100]; unsigned char *trashBuffer = NULL; @@ -426,8 +427,9 @@ FileReadGIF( return TCL_ERROR; } for (i = 1; i < argc; i++) { + int optionIdx; if (Tcl_GetIndexFromObjStruct(interp, objv[i], optionStrings, - sizeof(char *), "option name", 0, &nBytes) != TCL_OK) { + sizeof(char *), "option name", 0, &optionIdx) != TCL_OK) { return TCL_ERROR; } if (i == (argc-1)) { @@ -591,6 +593,9 @@ FileReadGIF( */ if (trashBuffer == NULL) { + if (fileWidth > (UINT_MAX/3)/fileHeight) { + goto error; + } nBytes = fileWidth * fileHeight * 3; trashBuffer = ckalloc(nBytes); if (trashBuffer) { @@ -679,7 +684,13 @@ FileReadGIF( block.offset[1] = 1; block.offset[2] = 2; block.offset[3] = (transparent>=0) ? 3 : 0; + if (imageWidth > INT_MAX/block.pixelSize) { + goto error; + } block.pitch = block.pixelSize * imageWidth; + if (imageHeight > UINT_MAX/block.pitch) { + goto error; + } nBytes = block.pitch * imageHeight; block.pixelPtr = ckalloc(nBytes); if (block.pixelPtr) { |