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| author | Roberto Sassu <roberto.sassu@huawei.com> | 2021-10-05 15:08:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-20 12:44:58 +0300 |
| commit | faba7916cdc0da11c7402538fe95642b43c7b73b (patch) | |
| tree | b8d491e2ff447c7f3f3458ae70ff1f1177a659e8 /arch/s390 | |
| parent | 7ef43c0f68fb6d5c00c7ac32538b2e988d6a38e2 (diff) | |
| download | linux-faba7916cdc0da11c7402538fe95642b43c7b73b.tar.xz | |
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 93b3209b94a2..db4e539d8c7f 100644 --- a/arch/s390/lib/string.c +++ b/arch/s390/lib/string.c @@ -246,14 +246,13 @@ EXPORT_SYMBOL(strcmp); #ifdef __HAVE_ARCH_STRRCHR 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); #endif |