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Merge branch 'PHP-7.2' into PHP-7.3

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* PHP-7.2:
  Fix bug #77950 - Heap-buffer-overflow in _estrndup via exif_process_IFD_TAG
This commit is contained in:
Stanislav Malyshev 2019-04-30 00:05:43 -07:00
commit 66b32f25d5
3 changed files with 13 additions and 1 deletions
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2
ext/exif/exif.c
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@ -3277,7 +3277,7 @@ static int exif_process_IFD_TAG(image_info_type *ImageInfo, char *dir_entry, cha
offset_base is ImageInfo->file.list[sn].data-dir_offset
dir_entry - offset_base is dir_offset+2+i*12
*/
if (byte_count > IFDlength || offset_val > IFDlength-byte_count || value_ptr < dir_entry || offset_val < (size_t)(dir_entry-offset_base)) {
if (byte_count > IFDlength || offset_val > IFDlength-byte_count || value_ptr < dir_entry || offset_val < (size_t)(dir_entry-offset_base) || dir_entry <= offset_base) {
/* It is important to check for IMAGE_FILETYPE_TIFF
* JPEG does not use absolute pointers instead its pointers are
* relative to the start of the TIFF header in APP1 section. */

12
ext/exif/tests/bug77950.phpt Normal file
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@ -0,0 +1,12 @@
--TEST--
Bug #77950 (Heap-buffer-overflow in _estrndup via exif_process_IFD_TAG)
--SKIPIF--
<?php if (!extension_loaded('exif')) print 'skip exif extension not available';?>
--FILE--
<?php
exif_read_data(__DIR__."/bug77950.tiff");
?>
DONE
--EXPECTF--
%A
DONE

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ext/exif/tests/bug77950.tiff Normal file
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