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pi.c: avoid integer overflow, resulting in later invalid access to memory in opj_t2_decode_packets(). Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18979

This commit is contained in:
Even Rouault 2019-11-17 01:18:26 +01:00
parent 5875a6b446
commit 4cb1f66304
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GPG Key ID: 33EBBFC47B3DD87D
2 changed files with 14 additions and 14 deletions
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24
src/lib/openjp2/pi.c
View File

@ -376,10 +376,10 @@ static OPJ_BOOL opj_pi_next_rpcl(opj_pi_iterator_t * pi)
pi->poc.tx1 = pi->tx1;
}
for (pi->resno = pi->poc.resno0; pi->resno < pi->poc.resno1; pi->resno++) {
for (pi->y = pi->poc.ty0; pi->y < pi->poc.ty1;
pi->y += (OPJ_INT32)(pi->dy - (OPJ_UINT32)(pi->y % (OPJ_INT32)pi->dy))) {
for (pi->x = pi->poc.tx0; pi->x < pi->poc.tx1;
pi->x += (OPJ_INT32)(pi->dx - (OPJ_UINT32)(pi->x % (OPJ_INT32)pi->dx))) {
for (pi->y = (OPJ_UINT32)pi->poc.ty0; pi->y < (OPJ_UINT32)pi->poc.ty1;
pi->y += (pi->dy - (pi->y % pi->dy))) {
for (pi->x = (OPJ_UINT32)pi->poc.tx0; pi->x < (OPJ_UINT32)pi->poc.tx1;
pi->x += (pi->dx - (pi->x % pi->dx))) {
for (pi->compno = pi->poc.compno0; pi->compno < pi->poc.compno1; pi->compno++) {
OPJ_UINT32 levelno;
OPJ_INT32 trx0, try0;
@ -508,10 +508,10 @@ static OPJ_BOOL opj_pi_next_pcrl(opj_pi_iterator_t * pi)
pi->poc.ty1 = pi->ty1;
pi->poc.tx1 = pi->tx1;
}
for (pi->y = pi->poc.ty0; pi->y < pi->poc.ty1;
pi->y += (OPJ_INT32)(pi->dy - (OPJ_UINT32)(pi->y % (OPJ_INT32)pi->dy))) {
for (pi->x = pi->poc.tx0; pi->x < pi->poc.tx1;
pi->x += (OPJ_INT32)(pi->dx - (OPJ_UINT32)(pi->x % (OPJ_INT32)pi->dx))) {
for (pi->y = (OPJ_UINT32)pi->poc.ty0; pi->y < (OPJ_UINT32)pi->poc.ty1;
pi->y += (pi->dy - (pi->y % pi->dy))) {
for (pi->x = (OPJ_UINT32)pi->poc.tx0; pi->x < (OPJ_UINT32)pi->poc.tx1;
pi->x += (pi->dx - (pi->x % pi->dx))) {
for (pi->compno = pi->poc.compno0; pi->compno < pi->poc.compno1; pi->compno++) {
comp = &pi->comps[pi->compno];
for (pi->resno = pi->poc.resno0;
@ -639,10 +639,10 @@ static OPJ_BOOL opj_pi_next_cprl(opj_pi_iterator_t * pi)
pi->poc.ty1 = pi->ty1;
pi->poc.tx1 = pi->tx1;
}
for (pi->y = pi->poc.ty0; pi->y < pi->poc.ty1;
pi->y += (OPJ_INT32)(pi->dy - (OPJ_UINT32)(pi->y % (OPJ_INT32)pi->dy))) {
for (pi->x = pi->poc.tx0; pi->x < pi->poc.tx1;
pi->x += (OPJ_INT32)(pi->dx - (OPJ_UINT32)(pi->x % (OPJ_INT32)pi->dx))) {
for (pi->y = (OPJ_UINT32)pi->poc.ty0; pi->y < (OPJ_UINT32)pi->poc.ty1;
pi->y += (pi->dy - (pi->y % pi->dy))) {
for (pi->x = (OPJ_UINT32)pi->poc.tx0; pi->x < (OPJ_UINT32)pi->poc.tx1;
pi->x += (pi->dx - (pi->x % pi->dx))) {
for (pi->resno = pi->poc.resno0;
pi->resno < opj_uint_min(pi->poc.resno1, comp->numresolutions); pi->resno++) {
OPJ_UINT32 levelno;

4
src/lib/openjp2/pi.h
View File

@ -102,9 +102,9 @@ typedef struct opj_pi_iterator {
/** Components*/
opj_pi_comp_t *comps;
/** FIXME DOC*/
OPJ_INT32 tx0, ty0, tx1, ty1;
OPJ_UINT32 tx0, ty0, tx1, ty1;
/** FIXME DOC*/
OPJ_INT32 x, y;
OPJ_UINT32 x, y;
/** FIXME DOC*/
OPJ_UINT32 dx, dy;
} opj_pi_iterator_t;