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winansi: check result before using Name for pty #1245

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1480c1
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@1480c1 1480c1 commented May 30, 2022

Unsure which branch to really base this off, so I have used maint.

Should be a simple fix for checking if NtQueryObject() actually returned a name under very
specific circumstances under Wine staging, however, I am not very confident if it's the best option.
Alternatives have been listed in the commit message.

CC: Johannes Schindelin [email protected]

NtQueryObject under Wine can return a success but fill out no name.
In those situations, Wine will set Buffer to NULL, and set result to
the sizeof(OBJECT_NAME_INFORMATION).

Running a command such as

echo "$(git.exe --version 2>/dev/null)"

will crash due to a NULL pointer dereference when the code attempts to
null terminate the buffer, although, weirdly, removing the subshell or
redirecting stdout to a file will not trigger the crash.

Alternatives include checking Buffer itself, however, I am not sure
what is the official behavior of the function due to a lack of
documentation.
Another alternative is to check the Length field, but similar to above,
I do not know what the official behavior is.

This code is based on the behavior of NtQueryObject under wine and
reactos.

Signed-off-by: Christopher Degawa <[email protected]>
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dscho commented May 30, 2022

@1480c1 would you prefer to continue here, or in git-for-windows#3875?

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dscho commented May 30, 2022

/allow

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1480c1 commented May 30, 2022

@1480c1 would you prefer to continue here, or in git-for-windows#3875?

If I continue in git-for-windows#3875, would I have to continue in here, aka, if the one in git-for-windows is accepted, will you be the one to handle to get it upstreamed? I personally would prefer in git-for-windows since, at least I assume, it would hopefully make it to a git-for-windows release sooner, and that way I can also get a mingw-w64-git package from the azure pipeline

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dscho commented May 30, 2022

if the one in git-for-windows is accepted, will you be the one to handle to get it upstreamed?

I did handle past contributions that way, yes. If you want to contribute this PR via GitGitGadget yourself, that's fine with me, too. I just need to know whether action is required from my side ;-)

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1480c1 commented May 30, 2022

I will continue in the other PR and let you handle the contribution to upstream, just in case there are some other bugs with wine and such that need to be ironed out

@1480c1 1480c1 closed this May 30, 2022
@1480c1 1480c1 deleted the for-git/wine/detect_msys_tty branch May 30, 2022 17:20
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