LCMS upstream patch to fix integer overflows
Patch:
https://github.com/mm2/Little-CMS/commit/9f427d5ff544ab1be37f485ac13b2419a1610cc3
BUG=696430
Change-Id: I20b8b4aad565d6f6aaed8c66be7e9709eec2b5ce
Reviewed-on: https://pdfium-review.googlesource.com/2849
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>
diff --git a/third_party/lcms2-2.6/0017-upstream-integer-overflow-MPEmatrix_Read.patch b/third_party/lcms2-2.6/0017-upstream-integer-overflow-MPEmatrix_Read.patch
new file mode 100644
index 0000000..47df7a8
--- /dev/null
+++ b/third_party/lcms2-2.6/0017-upstream-integer-overflow-MPEmatrix_Read.patch
@@ -0,0 +1,85 @@
+diff --git a/third_party/lcms2-2.6/src/cmscgats.c b/third_party/lcms2-2.6/src/cmscgats.c
+index 5720c66a7..cce4cedba 100644
+--- a/third_party/lcms2-2.6/src/cmscgats.c
++++ b/third_party/lcms2-2.6/src/cmscgats.c
+@@ -150,23 +150,24 @@ typedef struct {
+ SUBALLOCATOR Allocator; // String suballocator -- just to keep it fast
+
+ // Parser state machine
+- SYMBOL sy; // Current symbol
+- int ch; // Current character
++ SYMBOL sy; // Current symbol
++ int ch; // Current character
++
++ cmsInt32Number inum; // integer value
++ cmsFloat64Number dnum; // real value
+
+- int inum; // integer value
+- cmsFloat64Number dnum; // real value
+ char id[MAXID]; // identifier
+ char str[MAXSTR]; // string
+
+ // Allowed keywords & datasets. They have visibility on whole stream
+- KEYVALUE* ValidKeywords;
+- KEYVALUE* ValidSampleID;
++ KEYVALUE* ValidKeywords;
++ KEYVALUE* ValidSampleID;
+
+ char* Source; // Points to loc. being parsed
+- int lineno; // line counter for error reporting
++ cmsInt32Number lineno; // line counter for error reporting
+
+ FILECTX* FileStack[MAXINCLUDE]; // Stack of files being parsed
+- int IncludeSP; // Include Stack Pointer
++ cmsInt32Number IncludeSP; // Include Stack Pointer
+
+ char* MemoryBlock; // The stream if holded in memory
+
+@@ -568,8 +569,8 @@ void ReadReal(cmsIT8* it8, int inum)
+ // Exponent, example 34.00E+20
+ if (toupper(it8->ch) == 'E') {
+
+- int e;
+- int sgn;
++ cmsInt32Number e;
++ cmsInt32Number sgn;
+
+ NextCh(it8); sgn = 1;
+
+@@ -587,7 +588,7 @@ void ReadReal(cmsIT8* it8, int inum)
+ e = 0;
+ while (isdigit(it8->ch)) {
+
+- if ((cmsFloat64Number) e * 10L < INT_MAX)
++ if ((cmsFloat64Number) e * 10L < (cmsFloat64Number) +2147483647.0)
+ e = e * 10 + (it8->ch - '0');
+
+ NextCh(it8);
+@@ -777,7 +778,7 @@ void InSymbol(cmsIT8* it8)
+
+ while (isdigit(it8->ch)) {
+
+- if ((long) it8->inum * 10L > (long) INT_MAX) {
++ if ((cmsFloat64Number) it8->inum * 10L > (cmsFloat64Number) +2147483647.0) {
+ ReadReal(it8, it8->inum);
+ it8->sy = SDNUM;
+ it8->dnum *= sign;
+diff --git a/third_party/lcms2-2.6/src/cmstypes.c b/third_party/lcms2-2.6/src/cmstypes.c
+index 0256e247b..75f1fae32 100644
+--- a/third_party/lcms2-2.6/src/cmstypes.c
++++ b/third_party/lcms2-2.6/src/cmstypes.c
+@@ -4199,9 +4199,13 @@ void *Type_MPEmatrix_Read(struct _cms_typehandler_struct* self, cmsIOHANDLER* io
+ if (!_cmsReadUInt16Number(io, &OutputChans)) return NULL;
+
+
++ // Input and output chans may be ANY (up to 0xffff),
++ // but we choose to limit to 16 channels for now
++ if (InputChans >= cmsMAXCHANNELS) return NULL;
++ if (OutputChans >= cmsMAXCHANNELS) return NULL;
++
+ nElems = InputChans * OutputChans;
+
+- // Input and output chans may be ANY (up to 0xffff)
+ Matrix = (cmsFloat64Number*) _cmsCalloc(self ->ContextID, nElems, sizeof(cmsFloat64Number));
+ if (Matrix == NULL) return NULL;
+