[BUGFIX] Many issues "If memory allocation fails, then there is a possible null pointer dereference:" fixed.

Author: Gonzalo Diaz

.github/workflows/clang-format.yml

@@ -21,17 +21,17 @@ jobs:
       - name: Install dependencies
         # yamllint disable rule:line-length
         run: |
-          mkdir -p /etc/apt/keyrings
+          sudo mkdir -p /etc/apt/keyrings
           curl -fsSL https://apt.llvm.org/llvm-snapshot.gpg.key \
-          | gpg --dearmor -o /etc/apt/keyrings/llvm-snapshot.gpg
+          | sudo gpg --dearmor -o /etc/apt/keyrings/llvm-snapshot.gpg
           echo "deb [signed-by=/etc/apt/keyrings/llvm-snapshot.gpg] http://apt.llvm.org/jammy/ llvm-toolchain-jammy-22 main" \
-          | tee /etc/apt/sources.list.d/llvm.list && \
+          | sudo tee /etc/apt/sources.list.d/llvm.list && \
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
           sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy main"
           sudo apt-get -y update
           sudo apt-get -y install --no-install-recommends --no-install-suggests clang-format-22
           sudo update-alternatives --install /usr/bin/clang-format clang-format $(which clang-format-22) 100
-          sudo update-alternatives --set clang-format $(update-alternatives --list clang-format | grep clang-format-19)
+          sudo update-alternatives --set clang-format $(update-alternatives --list clang-format | grep clang-format-22)
           # yamllint enable rule:line-length
 
       - name: Check Tools

src/lib/exercises/src/hackerrank/warmup/compare_triplets.c

@@ -12,6 +12,9 @@ int *HACKERRANK_WARMUP_compareTriplets(int a_count, const int *a, int b_count,
 
   *result_count = 2;
   int *awards = malloc(sizeof(int) * *result_count);
+  if (awards == NULL) {
+    return NULL;
+  }
 
   awards[0] = 0;
   awards[1] = 0;

src/lib/exercises/src/hackerrank/warmup/mini_max_sum.c

@@ -27,6 +27,9 @@ char *HACKERRANK_WARMUP_miniMaxSumCalculate(int arr_count, const int *arr) {
 
   const int BUFFER_MAX_SIZE = 100;
   char *buffer = malloc(BUFFER_MAX_SIZE * sizeof(char));
+  if (buffer == NULL) {
+    return NULL;
+  }
 
   snprintf(buffer, BUFFER_MAX_SIZE, "%lld %lld", tsum - tmax, tsum - tmin);
   return buffer;

src/lib/exercises/src/hackerrank/warmup/plus_minus.c

@@ -11,6 +11,9 @@ const int BUFFER_MAX_SIZE = 10;
 
 char *format_result(double number) {
   char *buffer = malloc(BUFFER_MAX_SIZE * sizeof(char));
+  if (buffer == NULL) {
+    return NULL;
+  }
 
   snprintf(buffer, BUFFER_MAX_SIZE, "%0.6lf", number);
   return buffer;
@@ -45,9 +48,16 @@ char **HACKERRANK_WARMUP_plusMinusCalculate(int arr_count, const int *arr) {
 
   int n = 3; // Número de strings (puede ser arbitrario)
   char **answer = malloc(n * sizeof(char *)); // Array de punteros
+  if (answer == NULL) {
+    return NULL;
+  }
 
   for (i = 0; i < n; i++) {
     char *formatted = format_result(results[i]);
+    if (formatted == NULL) {
+      HACKERRANK_WARMUP_freePlusMinus(answer, i);
+      return NULL;
+    }
     answer[i] = formatted;
   }
 

src/lib/exercises/src/hackerrank/warmup/staircase.c

@@ -10,9 +10,16 @@
 char **HACKERRANK_WARMUP_staircaseCalculate(int n) {
 
   char **answer = malloc(n * sizeof(char *)); // Array of char pointers
+  if (answer == NULL) {
+    return NULL;
+  }
 
   for (int i = 0; i < n; i++) {
     char *line = malloc((n + 1) * sizeof(char)); // Array of char values
+    if (line == NULL) {
+      HACKERRANK_WARMUP_freeStaircase(answer, i);
+      return NULL;
+    }
 
     for (int j = 0; j < n; j++) {
       if (j < n - i - 1) {