diff command

Description:

diff -y <file1> <file2> may fail with malloc error.

Additional info:

• diffutils-3.11
• upstream patches
  • diff -y crashes with apparent memory corruption
  • diff: fix allocation typo leading to crashes
  • tests: test for diff -y crash
  • tests: make seq replacement more available

Steps to reproduce:

1. Step 1

   file1

   file2

2. diff -y file1 file2

   1. malloc(): invalid size (unsorted)..

3. file1.alt

   file2.alt

4. diff -y file1.alt file2.alt

   1. no problem

5. compile code with patch, no issues with either of the above steps