On Mon, Nov 16, 2015 at 7:53 AM, Hendrik Leppkes <h.lepp...@gmail.com> wrote:
> On Mon, Nov 16, 2015 at 1:52 PM, Ganesh Ajjanagadde <gajja...@mit.edu> wrote:
>> On Mon, Nov 16, 2015 at 3:27 AM, wm4 <nfx...@gmail.com> wrote:
>>> On Sun, 15 Nov 2015 17:56:22 -0500
>>> Ganesh Ajjanagadde <gajjanaga...@gmail.com> wrote:
>>>
>>>> ffio_ensure_seekback can fail due to e.g ENOMEM. This return value is
>>>> propagated here, and all usage in the codebase now has its return value
>>>> checked.
>>>>
>>>> A potential memory leak in mp3_read_header is also fixed via a goto
>>>> fail.
>>>>
>>>> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
>>>> ---
>>>> libavformat/mp3dec.c | 12 +++++++++---
>>>> libavformat/rmdec.c | 3 ++-
>>>> 2 files changed, 11 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
>>>> index 32ca00c..9fefe2d 100644
>>>> --- a/libavformat/mp3dec.c
>>>> +++ b/libavformat/mp3dec.c
>>>> @@ -373,18 +373,20 @@ static int mp3_read_header(AVFormatContext *s)
>>>>
>>>> ret = ff_replaygain_export(st, s->metadata);
>>>> if (ret < 0)
>>>> - return ret;
>>>> + goto fail;
>>>>
>>>> off = avio_tell(s->pb);
>>>> for (i = 0; i < 64 * 1024; i++) {
>>>> uint32_t header, header2;
>>>> int frame_size;
>>>> if (!(i&1023))
>>>> - ffio_ensure_seekback(s->pb, i + 1024 + 4);
>>>> + if ((ret = ffio_ensure_seekback(s->pb, i + 1024 + 4)) < 0)
>>>> + goto fail;
>>>> frame_size = check(s->pb, off + i, &header);
>>>> if (frame_size > 0) {
>>>> avio_seek(s->pb, off, SEEK_SET);
>>>> - ffio_ensure_seekback(s->pb, i + 1024 + frame_size + 4);
>>>> + if ((ret = ffio_ensure_seekback(s->pb, i + 1024 + frame_size
>>>> + 4)) < 0)
>>>> + goto fail;
>>>> if (check(s->pb, off + i + frame_size, &header2) >= 0 &&
>>>> (header & SAME_HEADER_MASK) == (header2 &
>>>> SAME_HEADER_MASK))
>>>> {
>>>> @@ -402,6 +404,10 @@ static int mp3_read_header(AVFormatContext *s)
>>>>
>>>> /* the parameters will be extracted from the compressed bitstream */
>>>> return 0;
>>>> +
>>>> +fail:
>>>> + ff_free_stream(s, st);
>>>> + return ret;
>>>> }
>>>>
>>>> #define MP3_PACKET_SIZE 1024
>>>> diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c
>>>> index 4ec78ef..d6e820e 100644
>>>> --- a/libavformat/rmdec.c
>>>> +++ b/libavformat/rmdec.c
>>>> @@ -576,7 +576,8 @@ static int rm_read_header(AVFormatContext *s)
>>>> size = avio_rb32(pb);
>>>> codec_pos = avio_tell(pb);
>>>>
>>>> - ffio_ensure_seekback(pb, 4);
>>>> + if ((ret = ffio_ensure_seekback(pb, 4)) < 0)
>>>> + goto fail;
>>>> v = avio_rb32(pb);
>>>> if (v == MKBETAG('M', 'L', 'T', 'I')) {
>>>> int number_of_streams = avio_rb16(pb);
>>>
>>> NACK. There's no reason to fatally fail in these cases.
>>
>> Ok, will split into two for the memory leak and these return values.
>> For the return values, will simply log at AV_LOG_WARNING.
>>
>
> There is no actual memory leak here, the stream is free'ed when the
> format context is closed.
Thanks for clarifying, indeed it is part of the context via
avformat_new_stream. I was concerned that this was being called
multiple times. Seems like it is all ok, and checked the docs.
>
> - Hendrik
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