6.1-stable review patch. If anyone has any objections, please let me know.
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From: Zichen Xie zichenxie0106@gmail.com
[ Upstream commit 078bf9438a31567e2c0587159ccefde835fb1ced ]
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 Link: https://lore.kernel.org/r/20241128032955.11711-1-zichenxie0106@gmail.com [mic: Simplify fix] Signed-off-by: Mickaël Salaün mic@digikod.net Signed-off-by: Sasha Levin sashal@kernel.org --- samples/landlock/sandboxer.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c index f29bb3c722307..ce9b77bc167b1 100644 --- a/samples/landlock/sandboxer.c +++ b/samples/landlock/sandboxer.c @@ -65,6 +65,9 @@ static int parse_path(char *env_path, const char ***const path_list) } } *path_list = malloc(num_paths * sizeof(**path_list)); + if (!*path_list) + return -1; + for (i = 0; i < num_paths; i++) (*path_list)[i] = strsep(&env_path, ENV_PATH_TOKEN);
@@ -99,6 +102,10 @@ static int populate_ruleset(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 < 0) { + fprintf(stderr, "Failed to allocate memory\n"); + goto out_free_name; + } if (num_paths == 1 && path_list[0][0] == '\0') { /* * Allows to not use all possible restrictions (e.g. use