[Bug 201226] graphics/lcms2: crashes with SIGBUS on armv6

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201226

            Bug ID: 201226
           Summary: graphics/lcms2: crashes with SIGBUS on armv6
           Product: Ports & Packages
           Version: Latest
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: mikael.urankar at gmail.com
                CC: freebsd-arm at FreeBSD.org
          Assignee: sunpoet at FreeBSD.org
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)
                CC: freebsd-arm at FreeBSD.org

Created attachment 158195
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158195&action=edit
sigbus fix

Hi,

I hit the following sigbus on armv6 (texstudio is triggering the sigbus):

gdb texstudio
<snip>

Program received signal SIGBUS, Bus error.
[Switching to Thread 2c462300 (LWP 100271/texstudio)]
cmsMLUsetWide (mlu=0x2cc381e0, Language=0x228bc91c "en", Country=0x228bc379
"US", WideString=0x228bc128)
    at cmsnamed.c:224
224        cmsUInt16Number Cntry = _cmsAdjustEndianess16(*(cmsUInt16Number*)
Country);
Current language:  auto; currently minimal

(gdb) where
#0  cmsMLUsetWide (mlu=0x2cc381e0, Language=0x228bc91c "en", Country=0x228bc379
"US", WideString=0x228bc128)
    at cmsnamed.c:224
#1  0x22897730 in SetTextTags (hProfile=0x2ccd1c00, Description=0x228bc128) at
cmsvirt.c:44
#2  0x228972f8 in cmsCreateRGBProfileTHR (ContextID=0x0, WhitePoint=0xbe5f0aa0,
Primaries=0xbe5f0a58, 
    TransferFunction=0xbe5f0a4c) at cmsvirt.c:141
#3  0x22898b3c in cmsCreate_sRGBProfileTHR (ContextID=0x0) at cmsvirt.c:658
#4  0x22898c8c in cmsCreate_sRGBProfile () at cmsvirt.c:672
#5  0x224dd158 in GfxColorSpace::setupColorProfiles () from
/usr/local/lib/libpoppler.so.49
#6  0x224f1180 in GfxState::GfxState () from /usr/local/lib/libpoppler.so.49
#7  0x2cc3f140 in ?? ()

(gdb) disassemble $pc-18 $pc+16
Dump of assembler code from 0x2289223c to 0x2289225c:
0x2289223c <cmsMLUsetWide+64>:    str    r5, [sp, #12]
0x22892240 <cmsMLUsetWide+68>:    bl    0x2285e138 <$a+96>
0x22892244 <cmsMLUsetWide+72>:    strh    r0, [r11, #-30]
0x22892248 <cmsMLUsetWide+76>:    ldr    r0, [r11, #-24]
0x2289224c <cmsMLUsetWide+80>:    ldrh    r0, [r0]
0x22892250 <cmsMLUsetWide+84>:    bl    0x2285e138 <$a+96>
0x22892254 <cmsMLUsetWide+88>:    strh    r0, [sp, #32]
0x22892258 <cmsMLUsetWide+92>:    ldr    r0, [r11, #-16]
End of assembler dump.

(gdb) info registers
r0             0x228bc379    579584889
<snip>

r0 is not 2-byte aligned.

The attached patch (from debian [1]) fixes that. It was successfully tested by
Ulrich Grey.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=644473

Thanks.

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