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avformat/rtmppkt: Simplify and deobfuscate amf_tag_skip() slightly

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Found while reviewing: CID1530313 Untrusted loop bound

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-06-07 23:05:47 +02:00
parent 665be4fa2f
commit cedbef0394
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GPG Key ID: B18E8928B3948D64
1 changed files with 2 additions and 4 deletions
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6
libavformat/rtmppkt.c
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@ -440,7 +440,6 @@ static int amf_tag_skip(GetByteContext *gb)
{ {
AMFDataType type; AMFDataType type;
unsigned nb = -1; unsigned nb = -1;
int parse_key = 1;
if (bytestream2_get_bytes_left(gb) < 1) if (bytestream2_get_bytes_left(gb) < 1)
return -1; return -1;
@ -465,13 +464,12 @@ static int amf_tag_skip(GetByteContext *gb)
bytestream2_skip(gb, 10); bytestream2_skip(gb, 10);
return 0; return 0;
case AMF_DATA_TYPE_ARRAY: case AMF_DATA_TYPE_ARRAY:
parse_key = 0;
case AMF_DATA_TYPE_MIXEDARRAY: case AMF_DATA_TYPE_MIXEDARRAY:
nb = bytestream2_get_be32(gb); nb = bytestream2_get_be32(gb);
case AMF_DATA_TYPE_OBJECT: case AMF_DATA_TYPE_OBJECT:
while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) { while (type != AMF_DATA_TYPE_ARRAY || nb-- > 0) {
int t; int t;
if (parse_key) { if (type != AMF_DATA_TYPE_ARRAY) {
int size = bytestream2_get_be16(gb); int size = bytestream2_get_be16(gb);
if (!size) { if (!size) {
bytestream2_get_byte(gb); bytestream2_get_byte(gb);