Re: [BUG] Misplaced quote in %d printf format crashes Zsh

["Mark J. Reed" <markjreed@xxxxxxxxx>]

Duplicated on my Macs; /bin/zsh (5.9) exhibits the crash on both x86_64 and ARM (M2). 

My locally-built 5.9.0.1-dev does not exhibit the symptom. To see if it was a build thing or the result of a code change, I checked out the zsh-5.9 tag and built that... and it also did not crash. So it seems to be something about Apple's build environment.

On Sat, Jun 8, 2024 at 7:04 PM Mark J. Reed <markjreed@xxxxxxxxx> wrote:

I'm away from my Mac at the moment, but FWIW, the crash does not appear to happen on Windows (MSYS64):

(0)> printf -v result " %5'd"

printf: %5': invalid directive

(1)> $0 --version

zsh 5.9 (x86_64-pc-msys)

On Sat, Jun 8, 2024 at 5:13 PM Philippe Altherr <philippe.altherr@xxxxxxxxx> wrote:

On macOS 14.5 running Zsh 5.9, the following command crashes Zsh:

% zsh -c "printf -v result \" %5'd\""

zsh:printf:1: %5': invalid directive

zsh(41890,0x7ff8450ddfc0) malloc: *** error for object 0x600002c811e0: pointer being realloc'd was not allocated

zsh(41890,0x7ff8450ddfc0) malloc: *** set a breakpoint in malloc_error_break to debug

zsh: abort      zsh -c "printf -v result \" %5'd\""

Surprisingly, dropping the -v option, removing the space before the %, or adding an echo command after the printf command avoid the crash:

% zsh -c "printf \" %5'd\"" 

zsh:printf:1: %5': invalid directive

 %

% zsh -c "printf -v result \"%5'd\""

zsh:printf:1: %5': invalid directive

% zsh -c "printf -v result \" %5'd\"; echo foo"

zsh:printf:1: %5': invalid directive

foo

Philippe

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Mark J. Reed <markjreed@xxxxxxxxx>

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Mark J. Reed <markjreed@xxxxxxxxx>