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-rw-r--r--third_party/libtiff/0019-oom-TIFFReadDirEntryArray.patch81
-rw-r--r--third_party/libtiff/README.pdfium1
-rw-r--r--third_party/libtiff/tif_dirread.c65
3 files changed, 114 insertions, 33 deletions
diff --git a/third_party/libtiff/0019-oom-TIFFReadDirEntryArray.patch b/third_party/libtiff/0019-oom-TIFFReadDirEntryArray.patch
new file mode 100644
index 0000000000..1144e06ef4
--- /dev/null
+++ b/third_party/libtiff/0019-oom-TIFFReadDirEntryArray.patch
@@ -0,0 +1,81 @@
+diff --git a/third_party/libtiff/tif_dirread.c b/third_party/libtiff/tif_dirread.c
+index 7dd944483..d50b39a80 100644
+--- a/third_party/libtiff/tif_dirread.c
++++ b/third_party/libtiff/tif_dirread.c
+@@ -790,44 +790,43 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* d
+ *count=(uint32)direntry->tdir_count;
+ datasize=(*count)*typesize;
+ assert((tmsize_t)datasize>0);
+- data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
+- if (data==0)
+- return(TIFFReadDirEntryErrAlloc);
++ const uint32 small_alloc_threshold=(tif->tif_flags&TIFF_BIGTIFF)? 8 : 4;
++ if (datasize <= small_alloc_threshold)
++ {
++ data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
++ if (data==0)
++ return(TIFFReadDirEntryErrAlloc);
++ _TIFFmemcpy(data,&direntry->tdir_offset,datasize);
++ *value=data;
++ return(TIFFReadDirEntryErrOk);
++ }
++ uint64 offset;
+ if (!(tif->tif_flags&TIFF_BIGTIFF))
+ {
+- if (datasize<=4)
+- _TIFFmemcpy(data,&direntry->tdir_offset,datasize);
+- else
+- {
+- enum TIFFReadDirEntryErr err;
+- uint32 offset = direntry->tdir_offset.toff_long;
+- if (tif->tif_flags&TIFF_SWAB)
+- TIFFSwabLong(&offset);
+- err=TIFFReadDirEntryData(tif,(uint64)offset,(tmsize_t)datasize,data);
+- if (err!=TIFFReadDirEntryErrOk)
+- {
+- _TIFFfree(data);
+- return(err);
+- }
+- }
++ uint32 small_offset=direntry->tdir_offset.toff_long;
++ if (tif->tif_flags&TIFF_SWAB)
++ TIFFSwabLong(&small_offset);
++ offset=(uint64)small_offset;
+ }
+ else
+ {
+- if (datasize<=8)
+- _TIFFmemcpy(data,&direntry->tdir_offset,datasize);
+- else
+- {
+- enum TIFFReadDirEntryErr err;
+- uint64 offset = direntry->tdir_offset.toff_long8;
+- if (tif->tif_flags&TIFF_SWAB)
+- TIFFSwabLong8(&offset);
+- err=TIFFReadDirEntryData(tif,offset,(tmsize_t)datasize,data);
+- if (err!=TIFFReadDirEntryErrOk)
+- {
+- _TIFFfree(data);
+- return(err);
+- }
+- }
++ offset = direntry->tdir_offset.toff_long8;
++ if (tif->tif_flags&TIFF_SWAB)
++ TIFFSwabLong8(&offset);
++ }
++ if ((uint64)(-1) - offset < datasize)
++ return(TIFFReadDirEntryErrIo);
++ const uint64 size=isMapped(tif)? (uint64)tif->tif_size : TIFFGetFileSize(tif);
++ if (offset + datasize > size)
++ return(TIFFReadDirEntryErrIo);
++ data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
++ if (data==0)
++ return(TIFFReadDirEntryErrAlloc);
++ enum TIFFReadDirEntryErr err=TIFFReadDirEntryData(tif,offset,(tmsize_t)datasize,data);
++ if (err!=TIFFReadDirEntryErrOk)
++ {
++ _TIFFfree(data);
++ return(err);
+ }
+ *value=data;
+ return(TIFFReadDirEntryErrOk);
diff --git a/third_party/libtiff/README.pdfium b/third_party/libtiff/README.pdfium
index 0b6b800604..b82bb7947a 100644
--- a/third_party/libtiff/README.pdfium
+++ b/third_party/libtiff/README.pdfium
@@ -23,3 +23,4 @@ Local Modifications:
0015-fix-leaks-in-tif_ojpeg.patch: fix direct leaks in tif_ojpeg.c methods
0017-safe_skews_in_gtTileContig.patch: return error if to/from skews overflow from int32.
0018-fix-leak-in-PredictorSetupDecode.patch: call tif->tif_cleanup if the setup fails.
+0019-oom-TIFFReadDirEntryArray.patch: Try to avoid out-of-memory in tif_dirread.c.
diff --git a/third_party/libtiff/tif_dirread.c b/third_party/libtiff/tif_dirread.c
index 7dd9444834..d50b39a809 100644
--- a/third_party/libtiff/tif_dirread.c
+++ b/third_party/libtiff/tif_dirread.c
@@ -790,44 +790,43 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* d
*count=(uint32)direntry->tdir_count;
datasize=(*count)*typesize;
assert((tmsize_t)datasize>0);
- data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
- if (data==0)
- return(TIFFReadDirEntryErrAlloc);
+ const uint32 small_alloc_threshold=(tif->tif_flags&TIFF_BIGTIFF)? 8 : 4;
+ if (datasize <= small_alloc_threshold)
+ {
+ data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
+ if (data==0)
+ return(TIFFReadDirEntryErrAlloc);
+ _TIFFmemcpy(data,&direntry->tdir_offset,datasize);
+ *value=data;
+ return(TIFFReadDirEntryErrOk);
+ }
+ uint64 offset;
if (!(tif->tif_flags&TIFF_BIGTIFF))
{
- if (datasize<=4)
- _TIFFmemcpy(data,&direntry->tdir_offset,datasize);
- else
- {
- enum TIFFReadDirEntryErr err;
- uint32 offset = direntry->tdir_offset.toff_long;
- if (tif->tif_flags&TIFF_SWAB)
- TIFFSwabLong(&offset);
- err=TIFFReadDirEntryData(tif,(uint64)offset,(tmsize_t)datasize,data);
- if (err!=TIFFReadDirEntryErrOk)
- {
- _TIFFfree(data);
- return(err);
- }
- }
+ uint32 small_offset=direntry->tdir_offset.toff_long;
+ if (tif->tif_flags&TIFF_SWAB)
+ TIFFSwabLong(&small_offset);
+ offset=(uint64)small_offset;
}
else
{
- if (datasize<=8)
- _TIFFmemcpy(data,&direntry->tdir_offset,datasize);
- else
- {
- enum TIFFReadDirEntryErr err;
- uint64 offset = direntry->tdir_offset.toff_long8;
- if (tif->tif_flags&TIFF_SWAB)
- TIFFSwabLong8(&offset);
- err=TIFFReadDirEntryData(tif,offset,(tmsize_t)datasize,data);
- if (err!=TIFFReadDirEntryErrOk)
- {
- _TIFFfree(data);
- return(err);
- }
- }
+ offset = direntry->tdir_offset.toff_long8;
+ if (tif->tif_flags&TIFF_SWAB)
+ TIFFSwabLong8(&offset);
+ }
+ if ((uint64)(-1) - offset < datasize)
+ return(TIFFReadDirEntryErrIo);
+ const uint64 size=isMapped(tif)? (uint64)tif->tif_size : TIFFGetFileSize(tif);
+ if (offset + datasize > size)
+ return(TIFFReadDirEntryErrIo);
+ data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
+ if (data==0)
+ return(TIFFReadDirEntryErrAlloc);
+ enum TIFFReadDirEntryErr err=TIFFReadDirEntryData(tif,offset,(tmsize_t)datasize,data);
+ if (err!=TIFFReadDirEntryErrOk)
+ {
+ _TIFFfree(data);
+ return(err);
}
*value=data;
return(TIFFReadDirEntryErrOk);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 11:48:17 +0000