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A use-after-free would occur when a valid page was followed by a page with invalid pixmap dimensions, causing bander -- a static -- to point to previously freed memory instead of a new band_writer.
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GerHobbelt
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Dec 9, 2022
$ ./build/sanitize/mutool draw -Dst ./x/tiff/segfault/goat.tiff
page ./x/tiff/segfault/goat.tiff 1AddressSanitizer:DEADLYSIGNAL
=================================================================
==3377970==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000018 (pc 0x55dfed459a1b bp 0x7ffecf93ebc0 sp 0x7ffecf93eac0 T0)
==3377970==The signal is caused by a READ memory access.
==3377970==Hint: address points to the zero page.
#0 0x55dfed459a1b in fz_convert_pixmap_samples source/fitz/colorspace.c:1421
#1 0x55dfed57bad0 in fz_convert_pixmap source/fitz/pixmap.c:1065
#2 0x55dfed481194 in convert_pixmap_for_painting source/fitz/draw-device.c:1682
ArtifexSoftware#3 0x55dfed482e2c in fz_draw_fill_image source/fitz/draw-device.c:1852
ArtifexSoftware#4 0x55dfed461d34 in fz_fill_image source/fitz/device.c:351
ArtifexSoftware#5 0x55dfed7841a0 in img_run_page source/cbz/muimg.c:105
ArtifexSoftware#6 0x55dfed466fe9 in fz_run_page_contents source/fitz/document.c:642
ArtifexSoftware#7 0x55dfed467358 in fz_run_page source/fitz/document.c:692
ArtifexSoftware#8 0x55dfed3ebbc9 in drawband source/tools/mudraw.c:624
ArtifexSoftware#9 0x55dfed3f0e91 in dodrawpage source/tools/mudraw.c:1125
ArtifexSoftware#10 0x55dfed3f32c1 in drawpage source/tools/mudraw.c:1460
ArtifexSoftware#11 0x55dfed3f3716 in drawrange source/tools/mudraw.c:1499
ArtifexSoftware#12 0x55dfed3f8fcf in mudraw_main source/tools/mudraw.c:2501
ArtifexSoftware#13 0x55dfed3e9736 in main source/tools/mutool.c:152
ArtifexSoftware#14 0x7fae19829209 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
ArtifexSoftware#15 0x7fae198292bb in __libc_start_main_impl ../csu/libc-start.c:389
ArtifexSoftware#16 0x55dfed3e8f60 in _start (/home/sebras/src/mupdf/build/sanitize/mutool+0x21bf60)
FelixEngl
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Sep 8, 2024
* build: make build flags features * build: use pkg-config crate for more robust library handling * build: revert to inverse handling of HAVE_* flags * build: remove useless features
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A use-after-free would occur when a valid page was followed by
a page with invalid pixmap dimensions, causing bander --
a static -- to point to previously freed memory instead of a new
band_writer.