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authorStefan Liebler <stli@linux.ibm.com>2024-07-11 11:28:53 +0200
committerStefan Liebler <stli@linux.ibm.com>2024-07-16 10:35:27 +0200
commit5ad449c398a845a9c84808e4ac603beaa1006909 (patch)
treeebdf4d991425240ee6356a0039f8cfaddda41a4d /sysdeps/libm-ieee754/e_log10.c
parentf80f3409e8b78b49b92dfdc22c08d6fa299d6920 (diff)
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s390x: Fix segfault in wcsncmp [BZ #31934] release/2.32/master
The z13/vector-optimized wcsncmp implementation segfaults if n=1
and there is only one character (equal on both strings) before
the page end.  Then it loads and compares one character and misses
to check n again.  The following load fails.

This patch removes the extra load and compare of the first character
and just start with the loop which uses vector-load-to-block-boundary.
This code-path also checks n.

With this patch both tests are passing:
- the simplified one mentioned in the bugzilla 31934
- the full one in Florian Weimer's patch:
"manual: Document a GNU extension for strncmp/wcsncmp"
(https://patchwork.sourceware.org/project/glibc/patch/874j9eml6y.fsf@oldenburg.str.redhat.com/):
On s390x-linux-gnu (z16), the new wcsncmp test fails due to bug 31934.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

(cherry picked from commit 9b7651410375ec8848a1944992d663d514db4ba7)
Diffstat (limited to 'sysdeps/libm-ieee754/e_log10.c')
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