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>

1 files changed, 85 insertions, 0 deletions

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 0000000000..47df7a887d
--- /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;
+