From cf4fe7f68b916db36cc19c7cd5298aea67b22bd9 Mon Sep 17 00:00:00 2001
From: Yay295 <Yay295@users.noreply.github.com>
Date: Mon, 23 Sep 2024 02:00:44 -0500
Subject: [PATCH] add check for positive xsize/ysize in ImagingFliDecode

---
 src/libImaging/FliDecode.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/libImaging/FliDecode.c b/src/libImaging/FliDecode.c
index 6b2518d35ce..957c0108fac 100644
--- a/src/libImaging/FliDecode.c
+++ b/src/libImaging/FliDecode.c
@@ -62,6 +62,10 @@ ImagingFliDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t byt
         state->errcode = IMAGING_CODEC_UNKNOWN;
         return -1;
     }
+    if (state->xsize <= 0 || state->ysize <= 0) {
+        state->errcode = IMAGING_CODEC_CONFIG;
+        return -1;
+    }
 
     chunks = I16(ptr + 6);
     ptr += 16;