[PATCH v2 0/4] sparse-checkout: fix segfault on malformed patterns

This series fixes some issues with parsing sparse-checkout patterns when
core.sparseCheckoutCone is enabled but the sparse-checkout file itself
contains patterns that don't match the cone mode format.

The first patch fixes a segfault first reported in [1]. The other two
patches are from an earlier submission [2] that never got picked up and I
lost track of. There was another patch involving 'git sparse-checkout init
--cone' that isn't necessary, especially with Elijah doing some work in that
space right now.

[1] https://github.com/git-for-windows/git/issues/3498 [2]
https://lore.kernel.org/git/pull.1043.git.1632160658.gitgitgadget@gmail.com (local)

Thanks, -Stolee

Derrick Stolee (4):
  sparse-checkout: fix segfault on malformed patterns
  sparse-checkout: fix OOM error with mixed patterns
  sparse-checkout: refuse to add to bad patterns
  amend! sparse-checkout: fix segfault on malformed patterns

 builtin/sparse-checkout.c          |  5 ++++-
 dir.c                              |  5 +----
 t/t1091-sparse-checkout-builtin.sh | 31 +++++++++++++++++++++++++++++-
 3 files changed, 35 insertions(+), 6 deletions(-)


base-commit: abe6bb3905392d5eb6b01fa6e54d7e784e0522aa
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1069%2Fderrickstolee%2Fsparse-checkout%2Finput-bug-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1069/derrickstolee/sparse-checkout/input-bug-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1069

Range-diff vs v1:

 1:  becbee16d2e ! 1:  a0e3dd335c9 sparse-checkout: fix segfault on malformed patterns
     @@ Commit message
          Add a test that triggers the segfault without the code change.
      
          Reported-by: John Burnett [off-list ref]
     +    Reviewed-by: Elijah Newren [off-list ref]
          Signed-off-by: Derrick Stolee [off-list ref]
      
       ## dir.c ##
 2:  239bf23eacb ! 2:  86fbf130c03 sparse-checkout: fix OOM error with mixed patterns
     @@ Commit message
      
          Reported-by: Calbabreaker [off-list ref]
          Helped-by: Taylor Blau [off-list ref]
     +    Reviewed-by: Elijah Newren [off-list ref]
          Signed-off-by: Derrick Stolee [off-list ref]
      
       ## builtin/sparse-checkout.c ##
 3:  cc52fb2b0b7 ! 3:  5d096e380a4 sparse-checkout: refuse to add to bad patterns
     @@ Commit message
          because of a test that adds non-cone mode patterns without cleaning them
          up. Perform that cleanup as part of the test now.
      
     +    Reviewed-by: Elijah Newren [off-list ref]
          Signed-off-by: Derrick Stolee [off-list ref]
      
       ## builtin/sparse-checkout.c ##
 -:  ----------- > 4:  7bacb3760f3 amend! sparse-checkout: fix segfault on malformed patterns

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