Add check on CGATS memory allocation in littlecms.

This pull in the relevant bits from upstream commit 768f70ca.

BUG=chromium:872189

Change-Id: I6a970a00ff322768cddc2825e4b6e3e12400d43d
Reviewed-on: https://pdfium-review.googlesource.com/41671
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

3 files changed, 34 insertions, 3 deletions

diff --git a/third_party/lcms/0032-cgats-allocation.patch b/third_party/lcms/0032-cgats-allocation.patch
new file mode 100644
index 0000000000..08204b53d6
--- /dev/null
+++ b/third_party/lcms/0032-cgats-allocation.patch
@@ -0,0 +1,24 @@
+diff --git a/third_party/lcms/src/cmscgats.c b/third_party/lcms/src/cmscgats.c
+index 55f74ede8..0738a1cce 100644
+--- a/third_party/lcms/src/cmscgats.c
++++ b/third_party/lcms/src/cmscgats.c
+@@ -1504,10 +1504,16 @@ void AllocateDataSet(cmsIT8* it8)
+     t-> nSamples   = atoi(cmsIT8GetProperty(it8, "NUMBER_OF_FIELDS"));
+     t-> nPatches   = atoi(cmsIT8GetProperty(it8, "NUMBER_OF_SETS"));
+ 
+-    t-> Data = (char**)AllocChunk (it8, ((cmsUInt32Number) t->nSamples + 1) * ((cmsUInt32Number) t->nPatches + 1) *sizeof (char*));
+-    if (t->Data == NULL) {
++    if (t -> nSamples < 0 || t->nSamples > 0x7ffe || t->nPatches < 0 || t->nPatches > 0x7ffe)
++    {
++        SynError(it8, "AllocateDataSet: too much data");
++    }
++    else {
++        t->Data = (char**)AllocChunk(it8, ((cmsUInt32Number)t->nSamples + 1) * ((cmsUInt32Number)t->nPatches + 1) * sizeof(char*));
++        if (t->Data == NULL) {
+ 
+-        SynError(it8, "AllocateDataSet: Unable to allocate data array");
++            SynError(it8, "AllocateDataSet: Unable to allocate data array");
++        }
+     }
+ 
+ }
diff --git a/third_party/lcms/README.pdfium b/third_party/lcms/README.pdfium
index f5ea9b1792..1a096c86d5 100644
--- a/third_party/lcms/README.pdfium
+++ b/third_party/lcms/README.pdfium
@@ -43,3 +43,4 @@ Local Modifications:
 0029-drop-register-keyword.patch: Remove deprecated 'register' keyword.
 0030-const-data.patch: Mark many data structures as const.
 0031-wrong-tag-element-count.patch: Handle tag element count mismatch as an error.
+0032-cgats-allocation.patch: Add check on CGATS memory allocation.
diff --git a/third_party/lcms/src/cmscgats.c b/third_party/lcms/src/cmscgats.c
index 55f74ede8b..0738a1cce3 100644
--- a/third_party/lcms/src/cmscgats.c
+++ b/third_party/lcms/src/cmscgats.c
@@ -1504,10 +1504,16 @@ void AllocateDataSet(cmsIT8* it8)
     t-> nSamples   = atoi(cmsIT8GetProperty(it8, "NUMBER_OF_FIELDS"));
     t-> nPatches   = atoi(cmsIT8GetProperty(it8, "NUMBER_OF_SETS"));
 
-    t-> Data = (char**)AllocChunk (it8, ((cmsUInt32Number) t->nSamples + 1) * ((cmsUInt32Number) t->nPatches + 1) *sizeof (char*));
-    if (t->Data == NULL) {
+    if (t -> nSamples < 0 || t->nSamples > 0x7ffe || t->nPatches < 0 || t->nPatches > 0x7ffe)
+    {
+        SynError(it8, "AllocateDataSet: too much data");
+    }
+    else {
+        t->Data = (char**)AllocChunk(it8, ((cmsUInt32Number)t->nSamples + 1) * ((cmsUInt32Number)t->nPatches + 1) * sizeof(char*));
+        if (t->Data == NULL) {
 
-        SynError(it8, "AllocateDataSet: Unable to allocate data array");
+            SynError(it8, "AllocateDataSet: Unable to allocate data array");
+        }
     }
 
 }