IV should always be 128 bits. If the IV attribute was truncated
inside EXT-X-KEY, padding on the left which is the same as when
using sequence number as IV.
---
I'm not sure which method is better: do padding or just return
AVERROR_INVALIDDATA?
libavformat/hls.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/libavformat/hls.c b/libavformat/hls.c
index 83ff4cc607..a7b632c20e 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -810,7 +810,13 @@ static int parse_playlist(HLSContext *c, const char *url,
if (!strcmp(info.method, "SAMPLE-AES"))
key_type = KEY_SAMPLE_AES;
if (!av_strncasecmp(info.iv, "0x", 2)) {
- ff_hex_to_data(iv, info.iv + 2);
+ int n = ff_hex_to_data(iv, info.iv + 2);
+ if (n < sizeof(iv)) {
+ av_log(c->ctx, AV_LOG_WARNING,
+ "Incomplete IV %s, padding on the left\n", info.iv);
+ memmove(iv + sizeof(iv) - n, iv, n);
+ memset(iv, 0, sizeof(iv) - n);
+ }
has_iv = 1;
}
av_strlcpy(key, info.uri, sizeof(key));
--
2.31.1
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