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Fix bug #78793

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This commit is contained in:
Stanislav Malyshev 2019-12-16 01:14:38 -08:00
parent d348cfb96f
commit c14eb8de97
2 changed files with 15 additions and 2 deletions
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5
ext/exif/exif.c
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@ -3240,8 +3240,9 @@ static int exif_process_IFD_in_MAKERNOTE(image_info_type *ImageInfo, char * valu
} }
for (de=0;de<NumDirEntries;de++) { for (de=0;de<NumDirEntries;de++) {
if (!exif_process_IFD_TAG(ImageInfo, dir_start + 2 + 12 * de, size_t offset = 2 + 12 * de;
offset_base, data_len, displacement, section_index, 0, maker_note->tag_table)) { if (!exif_process_IFD_TAG(ImageInfo, dir_start + offset,
offset_base, data_len - offset, displacement, section_index, 0, maker_note->tag_table)) {
return FALSE; return FALSE;
} }
} }

12
ext/exif/tests/bug78793.phpt Normal file
View File

@ -0,0 +1,12 @@
--TEST--
Bug #78793: Use-after-free in exif parsing under memory sanitizer
--FILE--
<?php
$f = "ext/exif/tests/bug77950.tiff";
for ($i = 0; $i < 10; $i++) {
@exif_read_data($f);
}
?>
===DONE===
--EXPECT--
===DONE===