[FFmpeg-cvslog] avformat/format: Stop reading data at EOF during probing

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed May 10 23:58:31 2023 +0200| [a860c51bbc56d61db30246aa866f890ebac1d18e] | committer: Michael Niedermayer

avformat/format: Stop reading data at EOF during probing

Issue found by: Сергей Колесников
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 80f6e0378beae69d31f24b036a1365405dea61d1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a860c51bbc56d61db30246aa866f890ebac1d18e
---

 libavformat/format.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/format.c b/libavformat/format.c
index c47490c8eb..109aa4c92e 100644
--- a/libavformat/format.c
+++ b/libavformat/format.c
@@ -228,6 +228,7 @@ int av_probe_input_buffer2(AVIOContext *pb, ff_const59 AVInputFormat **fmt,
     int ret = 0, probe_size, buf_offset = 0;
     int score = 0;
     int ret2;
+    int eof = 0;
 
     if (!max_probe_size)
         max_probe_size = PROBE_BUF_MAX;
@@ -251,7 +252,7 @@ int av_probe_input_buffer2(AVIOContext *pb, ff_const59 AVInputFormat **fmt,
         }
     }
 
-    for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt;
+    for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt && !eof;
          probe_size = FFMIN(probe_size << 1,
                             FFMAX(max_probe_size, probe_size + 1))) {
         score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
@@ -267,6 +268,7 @@ int av_probe_input_buffer2(AVIOContext *pb, ff_const59 AVInputFormat **fmt,
 
             score = 0;
             ret   = 0;          /* error was end of file, nothing read */
+            eof   = 1;
         }
         buf_offset += ret;
         if (buf_offset < offset)