From: Zichen Xie zichenxie0106@gmail.com

malloc() may return NULL, leading to NULL dereference. Add a NULL check.

Fixes: ba84b0bf5a16 ("samples/landlock: Add a sandbox manager example") Signed-off-by: Zichen Xie zichenxie0106@gmail.com Cc: stable@vger.kernel.org --- v2: Modify logic & Add Fixes tag. --- samples/landlock/sandboxer.c | 8 ++++++++ 1 file changed, 8 insertions(+)

diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c index 57565dfd74a2..ef2a34173d84 100644 --- a/samples/landlock/sandboxer.c +++ b/samples/landlock/sandboxer.c @@ -91,6 +91,9 @@ static int parse_path(char *env_path, const char ***const path_list) } } *path_list = malloc(num_paths * sizeof(**path_list)); + if (*path_list == NULL) + return -1; + for (i = 0; i < num_paths; i++) (*path_list)[i] = strsep(&env_path, ENV_DELIMITER);

@@ -127,6 +130,11 @@ static int populate_ruleset_fs(const char *const env_var, const int ruleset_fd, env_path_name = strdup(env_path_name); unsetenv(env_var); num_paths = parse_path(env_path_name, &path_list); + if (num_paths == -1) { + fprintf(stderr, "Failed to allocate memory\n"); + ret = 1; + goto out_free_name; + } if (num_paths == 1 && path_list[0][0] == '\0') { /* * Allows to not use all possible restrictions (e.g. use