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qt-faststart - stricter input validations

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1. validate the moov size before checking for cmov atom
2. avoid performing arithmetic operations on unvalidated numbers
3. verify the stco/co64 offset count does not overflow the stco/co64
atom (not only the moov atom)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
erankor 2018-05-29 16:18:05 +03:00 committed by Michael Niedermayer
parent a9dacdeea6
commit 500e638711
1 changed files with 9 additions and 4 deletions
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13
tools/qt-faststart.c
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@ -200,6 +200,11 @@ int main(int argc, char *argv[])
return 0;
}
if (atom_size < 16) {
printf("bad moov atom size\n");
goto error_out;
}
/* moov atom was, in fact, the last atom in the chunk; load the whole
* moov atom */
if (fseeko(infile, -atom_size, SEEK_END)) {
@ -239,12 +244,12 @@ int main(int argc, char *argv[])
if (atom_type == STCO_ATOM) {
printf(" patching stco atom...\n");
atom_size = BE_32(&moov_atom[i - 4]);
if (i + atom_size - 4 > moov_atom_size) {
if (atom_size < 16 || atom_size > moov_atom_size - i + 4) {
printf(" bad atom size\n");
goto error_out;
}
offset_count = BE_32(&moov_atom[i + 8]);
if (i + 12 + offset_count * UINT64_C(4) > moov_atom_size) {
if (offset_count > (atom_size - 16) / 4) {
printf(" bad atom size/element count\n");
goto error_out;
}
@ -260,12 +265,12 @@ int main(int argc, char *argv[])
} else if (atom_type == CO64_ATOM) {
printf(" patching co64 atom...\n");
atom_size = BE_32(&moov_atom[i - 4]);
if (i + atom_size - 4 > moov_atom_size) {
if (atom_size < 16 || atom_size > moov_atom_size - i + 4) {
printf(" bad atom size\n");
goto error_out;
}
offset_count = BE_32(&moov_atom[i + 8]);
if (i + 12 + offset_count * UINT64_C(8) > moov_atom_size) {
if (offset_count > (atom_size - 16) / 8) {
printf(" bad atom size/element count\n");
goto error_out;
}