Public bug reported:
davfs2 uses the fscanf format string "%a[0-9]". "%a" is part of C89, but
not C99, and tells fscanf to do the string allocation.
The fscanf man page states:
Note that the a modifier is not available if the program is compiled with
gcc -std=c99 or gcc -D_ISOC99_SOURCE (unless _GNU_SOURCE is also specified), in
which case the a is interpreted as a specifier for floating-point numbers (see
above).
Support for the m modifier was added to glibc starting with version 2.7,
and new programs should use that modifier instead of a.
Switching the a to an m prevents the crash.
** Affects: davfs2 (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "Fix crash in umount due to fscanf format"
https://bugs.launchpad.net/bugs/1859293/+attachment/5319301/+files/fixfscanf.patch
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https://bugs.launchpad.net/bugs/1859293
Title:
davfs2 umount.davfs crashes when compiled with gcc 9
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