diff options
| author | Roberto Sassu <roberto.sassu@huawei.com> | 2021-10-05 14:08:36 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-27 09:33:57 +0200 |
| commit | b476b7ea7a59a9d90dc51869caffad93368e2e18 (patch) | |
| tree | 79fda28b287e4cf0a1b15d2932888ea5d5cc078e /arch/s390 | |
| parent | c6dbb65de6a2864e19058b15a2d8a01485925cf6 (diff) | |
s390: fix strrchr() implementation
commit 8e0ab8e26b72a80e991c66a8abc16e6c856abe3d upstream.
Fix two problems found in the strrchr() implementation for s390
architectures: evaluate empty strings (return the string address instead of
NULL, if '\0' is passed as second argument); evaluate the first character
of non-empty strings (the current implementation stops at the second).
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Reported-by: Heiko Carstens <hca@linux.ibm.com> (incorrect behavior with empty strings)
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Link: https://lore.kernel.org/r/20211005120836.60630-1-roberto.sassu@huawei.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/lib/string.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/arch/s390/lib/string.c b/arch/s390/lib/string.c index 48352bffbc92..a82335215d54 100644 --- a/arch/s390/lib/string.c +++ b/arch/s390/lib/string.c @@ -225,14 +225,13 @@ EXPORT_SYMBOL(strcmp); */ char * strrchr(const char * s, int c) { - size_t len = __strend(s) - s; - - if (len) - do { - if (s[len] == (char) c) - return (char *) s + len; - } while (--len > 0); - return NULL; + ssize_t len = __strend(s) - s; + + do { + if (s[len] == (char)c) + return (char *)s + len; + } while (--len >= 0); + return NULL; } EXPORT_SYMBOL(strrchr); |