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gif2webp: fix crash with NULL extension data

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DGifGetExtension() may successfully return, but the data pointer should
still be validated

BUG=webp:310

Change-Id: I6cfe617871fef2fe07887e5f48bb20f7ab7cfb35
This commit is contained in:
James Zern 2016-10-07 11:21:18 -07:00
parent 68ae5b671f
commit 806f6279ae
1 changed files with 2 additions and 0 deletions
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2
examples/gif2webp.c
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@ -360,6 +360,8 @@ int main(int argc, const char *argv[]) {
if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) { if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) {
goto End; goto End;
} }
if (data == NULL) continue;
switch (extension) { switch (extension) {
case COMMENT_EXT_FUNC_CODE: { case COMMENT_EXT_FUNC_CODE: {
break; // Do nothing for now. break; // Do nothing for now.