Allow mmap calls to gracefully return absent ctx

This is to allow to freely call mc functions even if initialization failed.
They will now gracefully fail instead of segfaulting.

1 files changed, 25 insertions, 0 deletions

diff --git a/src/responder/nss/nsssrv_mmap_cache.c b/src/responder/nss/nsssrv_mmap_cache.c
index 542c837c..e312be19 100644
--- a/src/responder/nss/nsssrv_mmap_cache.c
+++ b/src/responder/nss/nsssrv_mmap_cache.c
@@ -376,6 +376,11 @@ static errno_t sss_mmap_cache_invalidate(struct sss_mc_ctx *mcc,
 {
     struct sss_mc_rec *rec;
 
+    if (mcc == NULL) {
+        /* cache not initialized ? */
+        return EINVAL;
+    }
+
     rec = sss_mc_find_record(mcc, key);
     if (rec == NULL) {
         /* nothing to invalidate */
@@ -408,6 +413,11 @@ errno_t sss_mmap_cache_pw_store(struct sss_mc_ctx *mcc,
     size_t pos;
     int ret;
 
+    if (mcc == NULL) {
+        /* cache not initialized ? */
+        return EINVAL;
+    }
+
     ret = snprintf(uidstr, 11, "%ld", (long)uid);
     if (ret > 10) {
         return EINVAL;
@@ -472,6 +482,11 @@ errno_t sss_mmap_cache_pw_invalidate_uid(struct sss_mc_ctx *mcc, uid_t uid)
     char *uidstr;
     errno_t ret;
 
+    if (mcc == NULL) {
+        /* cache not initialized ? */
+        return EINVAL;
+    }
+
     uidstr = talloc_asprintf(NULL, "%ld", (long)uid);
     if (!uidstr) {
         return ENOMEM;
@@ -529,6 +544,11 @@ int sss_mmap_cache_gr_store(struct sss_mc_ctx *mcc,
     size_t pos;
     int ret;
 
+    if (mcc == NULL) {
+        /* cache not initialized ? */
+        return EINVAL;
+    }
+
     ret = snprintf(gidstr, 11, "%ld", (long)gid);
     if (ret > 10) {
         return EINVAL;
@@ -589,6 +609,11 @@ errno_t sss_mmap_cache_gr_invalidate_gid(struct sss_mc_ctx *mcc, gid_t gid)
     char *gidstr;
     errno_t ret;
 
+    if (mcc == NULL) {
+        /* cache not initialized ? */
+        return EINVAL;
+    }
+
     gidstr = talloc_asprintf(NULL, "%ld", (long)gid);
     if (!gidstr) {
         return ENOMEM;