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-rw-r--r--erts/emulator/beam/external.c146
1 files changed, 98 insertions, 48 deletions
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
index d4ffc23536..0d2de1b199 100644
--- a/erts/emulator/beam/external.c
+++ b/erts/emulator/beam/external.c
@@ -1127,6 +1127,8 @@ BIF_RETTYPE term_to_binary_2(BIF_ALIST_2)
enum B2TState { /* order is somewhat significant */
B2TPrepare,
+ B2TUncompressChunk,
+ B2TSizeInit,
B2TSize,
B2TDecodeInit,
@@ -1161,12 +1163,9 @@ typedef struct {
} B2TDecodeContext;
typedef struct {
- /*Uint real_size;
- Uint dest_len;
- byte *dbytes;
- Binary *result_bin;
- Binary *destination_bin;
- z_stream stream;*/
+ z_stream stream;
+ byte* dbytes;
+ Uint dleft;
} B2TUncompressContext;
typedef struct B2TContext_t {
@@ -1215,7 +1214,8 @@ static uLongf binary2term_uncomp_size(byte* data, Sint size)
}
static ERTS_INLINE int
-binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size)
+binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size,
+ B2TContext* ctx)
{
byte *bytes = data;
Sint size = data_size;
@@ -1229,6 +1229,8 @@ binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size)
size--;
if (size < 5 || *bytes != COMPRESSED) {
state->extp = bytes;
+ if (ctx)
+ ctx->state = B2TSizeInit;
}
else {
uLongf dest_len = (Uint32) get_int32(bytes+1);
@@ -1236,14 +1238,33 @@ binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size)
size -= 5;
if (dest_len > 32*1024*1024
|| (state->extp = erts_alloc_fnf(ERTS_ALC_T_EXT_TERM_DATA, dest_len)) == NULL) {
+ /*
+ * Try avoid out-of-memory crash due to corrupted 'dest_len'
+ * by checking the actual length of the uncompressed data.
+ * The only way to do that is to uncompress it. Sad but true.
+ */
if (dest_len != binary2term_uncomp_size(bytes, size)) {
return -1;
}
state->extp = erts_alloc(ERTS_ALC_T_EXT_TERM_DATA, dest_len);
+ ctx->reds -= dest_len;
}
state->exttmp = 1;
- if (erl_zlib_uncompress(state->extp, &dest_len, bytes, size) != Z_OK)
- return -1;
+ if (ctx) {
+ if (erl_zlib_inflate_start(&ctx->u.uc.stream, bytes, size) != Z_OK)
+ return -1;
+
+ ctx->u.uc.dbytes = state->extp;
+ ctx->u.uc.dleft = dest_len;
+ ctx->state = B2TUncompressChunk;
+ }
+ else {
+ uLongf dlen = dest_len;
+ if (erl_zlib_uncompress(state->extp, &dlen, bytes, size) != Z_OK
+ || dlen != dest_len) {
+ return -1;
+ }
+ }
size = (Sint) dest_len;
}
state->extsize = size;
@@ -1277,7 +1298,7 @@ erts_binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size
{
Sint res;
- if (binary2term_prepare(state, data, data_size) < 0 ||
+ if (binary2term_prepare(state, data, data_size, NULL) < 0 ||
(res=decoded_size(state->extp, state->extp + state->extsize, 0, NULL)) < 0) {
if (state->exttmp)
@@ -1307,6 +1328,9 @@ static void b2t_destroy_context(B2TContext* context)
ERTS_ALC_T_EXT_TERM_DATA);
context->aligned_alloc = NULL;
binary2term_abort(&context->b2ts);
+ if (context->state == B2TUncompressChunk) {
+ erl_zlib_inflate_finish(&context->u.uc.stream);
+ }
}
static void b2t_context_destructor(Binary *context_bin)
@@ -1359,7 +1383,8 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
do {
switch (ctx->state) {
- case B2TPrepare:
+ case B2TPrepare: {
+ Uint bin_size;
bytes = erts_get_aligned_binary_bytes_extra(bin,
&ctx->aligned_alloc,
ERTS_ALC_T_EXT_TERM_DATA,
@@ -1369,24 +1394,48 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
ctx->state = B2TBadArg;
break;
}
-
- ctx->heap_size = binary2term_prepare(&ctx->b2ts, bytes,
- binary_size(bin));
- if (ctx->heap_size < 0) {
- ctx->state = B2TBadArg;
- break;
+ bin_size = binary_size(bin);
+ if (ctx->aligned_alloc) {
+ ctx->reds -= bin_size / 8;
}
-
- ctx->reds = 0; /*SVERK*/
- ctx->u.sc.heap_size = 0;
- ctx->u.sc.terms = 1;
- ctx->u.sc.ep = ctx->b2ts.extp;
- ctx->u.sc.atom_extra_skip = 0;
- ctx->state = B2TSize;
+ if (binary2term_prepare(&ctx->b2ts, bytes, bin_size, ctx) < 0) {
+ ctx->state = B2TBadArg;
+ }
break;
+ }
+ case B2TUncompressChunk:
+ {
+ Uint chunk = ctx->reds;
+ int zret;
+ if (chunk > ctx->u.uc.dleft)
+ chunk = ctx->u.uc.dleft;
+
+ zret = erl_zlib_inflate_chunk(&ctx->u.uc.stream,
+ ctx->u.uc.dbytes, &chunk);
+ ctx->u.uc.dbytes += chunk;
+ ctx->u.uc.dleft -= chunk;
+ if (zret == Z_OK && ctx->u.uc.dleft > 0) {
+ ctx->reds = 0;
+ }
+ else if (erl_zlib_inflate_finish(&ctx->u.uc.stream) == Z_OK
+ && zret == Z_STREAM_END
+ && ctx->u.uc.dleft == 0) {
+ ctx->reds -= chunk;
+ ctx->state = B2TSizeInit;
+ }
+ else {
+ ctx->state = B2TBadArg;
+ }
+ break;
+ }
+ case B2TSizeInit:
+ ctx->u.sc.ep = NULL;
+ ctx->state = B2TSize;
+ /*fall through*/
case B2TSize:
- ctx->heap_size = decoded_size(NULL, ctx->b2ts.extp + ctx->b2ts.extsize,
+ ctx->heap_size = decoded_size(ctx->b2ts.extp,
+ ctx->b2ts.extp + ctx->b2ts.extsize,
0, ctx);
break;
@@ -1455,7 +1504,9 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
b2t_context_destructor);
ctx = ERTS_MAGIC_BIN_DATA(context_b);
sys_memcpy(ctx, &c_buff, sizeof(B2TContext));
-
+ if (ctx->state >= B2TDecode && ctx->u.dc.next == &c_buff.u.dc.res) {
+ ctx->u.dc.next = &ctx->u.dc.res;
+ }
if (!magic_space) {
ASSERT(ctx->state < B2TDecode);
magic_space = HAlloc(p, PROC_BIN_SIZE);
@@ -3914,25 +3965,27 @@ encode_size_struct_int(Process *p, ErtsAtomCacheMap *acmp, Eterm obj,
static Sint
decoded_size(byte *ep, byte* endp, int internal_tags, B2TContext* ctx)
{
- int heap_size = 0;
+ int heap_size;
int terms;
- int atom_extra_skip = 0;
+ int atom_extra_skip;
Uint n;
SWord reds;
if (ctx) {
- heap_size = ctx->u.sc.heap_size;
- terms = ctx->u.sc.terms;
- ep = ctx->u.sc.ep;
- atom_extra_skip = ctx->u.sc.atom_extra_skip;
reds = ctx->reds;
+ if (ctx->u.sc.ep) {
+ heap_size = ctx->u.sc.heap_size;
+ terms = ctx->u.sc.terms;
+ ep = ctx->u.sc.ep;
+ atom_extra_skip = ctx->u.sc.atom_extra_skip;
+ goto init_done;
+ }
}
- else {
- heap_size = 0;
- terms = 1;
- atom_extra_skip = 0;
- reds = ERTS_SWORD_MAX;
- }
+ heap_size = 0;
+ terms = 1;
+ atom_extra_skip = 0;
+init_done:
+
#define SKIP(sz) \
do { \
if ((sz) <= endp-ep) { \
@@ -4189,16 +4242,13 @@ decoded_size(byte *ep, byte* endp, int internal_tags, B2TContext* ctx)
}
terms--;
- if (--reds <= 0) {
- if (ctx && terms > 0) {
- ctx->u.sc.heap_size = heap_size;
- ctx->u.sc.terms = terms;
- ctx->u.sc.ep = ep;
- ctx->u.sc.atom_extra_skip = atom_extra_skip;
- ctx->reds = 0;
- return 0;
- }
- reds = ERTS_SWORD_MAX;
+ if (ctx && --reds <= 0 && terms > 0) {
+ ctx->u.sc.heap_size = heap_size;
+ ctx->u.sc.terms = terms;
+ ctx->u.sc.ep = ep;
+ ctx->u.sc.atom_extra_skip = atom_extra_skip;
+ ctx->reds = 0;
+ return 0;
}
}while (terms > 0);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 00:38:50 +0000