On Wed, Oct 23, 2024 at 6:38 AM Elena Salomatkina
<esalomatkina@xxxxxxxxx> wrote:
>
> strsep() modifies its first argument - buf.
> If an error occurs in the parsing loop, an invalid pointer
I deleted "If an error occurs in the parsing loop," because
this is _always_ a memory leak.
Applied to linux-kbuild/fixes. Thanks.
> will be passed to the free() function.
> Make the pointer passed to free() match the return value of
> read_text_file().
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Fixes: 9413e7640564 ("kbuild: split the second line of *.mod into *.usyms")
> Signed-off-by: Elena Salomatkina <esalomatkina@xxxxxxxxx>
> ---
> v3: Use 'pos' as the moving pointer
> v2: Rename 'orig' to 'pos'
>
> scripts/mod/sumversion.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c
> index 6bf9caca0968..9b552c6efb40 100644
> --- a/scripts/mod/sumversion.c
> +++ b/scripts/mod/sumversion.c
> @@ -385,7 +385,7 @@ static int parse_source_files(const char *objfile, struct md4_ctx *md)
> /* Calc and record src checksum. */
> void get_src_version(const char *modname, char sum[], unsigned sumlen)
> {
> - char *buf;
> + char *buf, *pos;
> struct md4_ctx md;
> char *fname;
> char filelist[PATH_MAX + 1];
> @@ -394,9 +394,10 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen)
> snprintf(filelist, sizeof(filelist), "%s.mod", modname);
>
> buf = read_text_file(filelist);
> -
> + pos = buf;
> +
> md4_init(&md);
> - while ((fname = strsep(&buf, "\n"))) {
> + while ((fname = strsep(&pos, "\n"))) {
> if (!*fname)
> continue;
> if (!(is_static_library(fname)) &&
> --
> 2.33.0
>
--
Best Regards
Masahiro Yamada
