On Thu, Mar 18, 2021 at 07:03:04PM +0530, Shreeya Patel wrote: > Following warning was reported by Kernel Test Robot. > > In function 'utf8_parse_version', > inlined from 'utf8_load' at fs/unicode/utf8mod.c:195:7: > >> fs/unicode/utf8mod.c:175:2: warning: 'strncpy' specified bound 12 equals > destination size [-Wstringop-truncation] > 175 | strncpy(version_string, version, sizeof(version_string)); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > The -Wstringop-truncation warning highlights the unintended > uses of the strncpy function that truncate the terminating NULL > character from the source string. > Unlike strncpy(), strscpy() always null-terminates the destination string, > hence use strscpy() instead of strncpy(). > > Signed-off-by: Shreeya Patel <shreeya.pa...@collabora.com> > Reported-by: kernel test robot <l...@intel.com> > --- > Changes in v2 > - Resolve warning of -Wstringop-truncation reported by > kernel test robot. > > fs/unicode/unicode-core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/unicode/unicode-core.c b/fs/unicode/unicode-core.c > index d5f09e022ac5..287a8a48836c 100644 > --- a/fs/unicode/unicode-core.c > +++ b/fs/unicode/unicode-core.c > @@ -179,7 +179,7 @@ static int unicode_parse_version(const char *version, > unsigned int *maj, > {0, NULL} > }; > > - strncpy(version_string, version, sizeof(version_string)); > + strscpy(version_string, version, sizeof(version_string)); >
Shouldn't unicode_parse_version() return an error if the string gets truncated here? I.e. check if strscpy() returns < 0. Also, this is a "fix" (though one that doesn't currently matter, since 'version' is currently always shorter than sizeof(version_string)), so it should go first in the series and have a Fixes tag. - Eric