From c81e350d5419cf02f029ce006d94f257bc18fb97 Mon Sep 17 00:00:00 2001
From: Ulrik <[email protected]>
Date: Thu, 26 Jan 2023 17:51:02 +0100
Subject: [PATCH 4/8] avformat/flacdec: Return correct error-codes on
read-failure
Forward errors from `avio_read` directly. When `avio_read` sees EOF before
expected bytes can be read, consistently return `AVERROR_INVALIDDATA`
We used to return `AVERROR(AVERROR_INVALIDDATA)` when failing to read
metadata block headers. `AVERROR_INVALIDDATA` is already negative, so
wrapping in `AVERROR` leads to double-negation.
We used to return `AVERROR(EIO)` when failing to read extended metadata.
However, many times, the IO-layer is not at fault, the input data is simply
corrupted (truncated), so we return `AVERROR_INVALIDDATA` here as well.
---
Tomas: changed to use AVERROR_EOF
---
libavformat/flacdec.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c
index 9f65c25864..77dcc620a4 100644
--- a/libavformat/flacdec.c
+++ b/libavformat/flacdec.c
@@ -81,8 +81,13 @@ static int flac_read_header(AVFormatContext *s)
/* process metadata blocks */
while (!avio_feof(s->pb) && !metadata_last) {
- if (avio_read(s->pb, header, 4) != 4)
- return AVERROR_INVALIDDATA;
+ ret = avio_read(s->pb, header, 4);
+ if (ret < 0) {
+ return ret;
+ } else if (ret != 4) {
+ return AVERROR_EOF;
+ }
+
flac_parse_block_header(header, &metadata_last, &metadata_type,
&metadata_size);
switch (metadata_type) {
@@ -96,8 +101,11 @@ static int flac_read_header(AVFormatContext *s)
if (!buffer) {
return AVERROR(ENOMEM);
}
- if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
- RETURN_ERROR(AVERROR(EIO));
+ ret = avio_read(s->pb, buffer, metadata_size);
+ if (ret < 0) {
+ RETURN_ERROR(ret);
+ } else if (ret != metadata_size) {
+ RETURN_ERROR(AVERROR_EOF);
}
break;
/* skip metadata block for unsupported types */
--
2.39.5
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