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WIP: what is this?
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$ ./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)
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@sebras @GerHobbelt
sebras authored and GerHobbelt committed Dec 9, 2022
1 parent 89ce53b commit 556c16d
Showing 1 changed file with 3 additions and 0 deletions.
3 changes: 3 additions & 0 deletions source/fitz/colorspace.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1426,6 +1426,9 @@ fz_convert_pixmap_samples(fz_context *ctx, const fz_pixmap *src, fz_pixmap *dst,
return;
}

if (!ss)
ss = fz_default_gray(ctx, default_cs);

fz_try(ctx)
{
/* Convert indexed into base colorspace. */
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