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-rw-r--r--ext/canvas/lib.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/canvas/lib.rs b/ext/canvas/lib.rs
index b05332c3f..72173f133 100644
--- a/ext/canvas/lib.rs
+++ b/ext/canvas/lib.rs
@@ -130,7 +130,8 @@ fn op_image_decode_png(#[buffer] buf: &[u8]) -> Result<DecodedPng, AnyError> {
)));
}
- let mut png_data = Vec::with_capacity(png.total_bytes() as usize);
+ // read_image will assert that the buffer is the correct size, so we need to fill it with zeros
+ let mut png_data = vec![0_u8; png.total_bytes() as usize];
png.read_image(&mut png_data)?;