From 391c3a1020127c9dbf6995effe2f84d3443292d8 Mon Sep 17 00:00:00 2001 From: Derrick Stolee Date: Thu, 16 Dec 2021 16:13:41 +0000 Subject: sparse-checkout: fix OOM error with mixed patterns Add a test to t1091-sparse-checkout-builtin.sh that would result in an infinite loop and out-of-memory error before this change. The issue relies on having non-cone-mode patterns while trying to modify the patterns in cone-mode. The fix is simple, allowing us to break from the loop when the input path does not contain a slash, as the "dir" pattern we added does not. This is only a fix to the critical out-of-memory error. A better response to such a strange state will follow in a later change. Reported-by: Calbabreaker Helped-by: Taylor Blau Reviewed-by: Elijah Newren Signed-off-by: Derrick Stolee Signed-off-by: Junio C Hamano --- builtin/sparse-checkout.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'builtin/sparse-checkout.c') diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c index d0f5c4702b..9ccdcde983 100644 --- a/builtin/sparse-checkout.c +++ b/builtin/sparse-checkout.c @@ -483,7 +483,7 @@ static void insert_recursive_pattern(struct pattern_list *pl, struct strbuf *pat char *oldpattern = e->pattern; size_t newlen; - if (slash == e->pattern) + if (!slash || slash == e->pattern) break; newlen = slash - e->pattern; -- cgit v1.2.3 From a3eca5844526fd6111e7a1e8bdfa9813673a6f23 Mon Sep 17 00:00:00 2001 From: Derrick Stolee Date: Thu, 16 Dec 2021 16:13:42 +0000 Subject: sparse-checkout: refuse to add to bad patterns When in cone mode sparse-checkout, it is unclear how 'git sparse-checkout add ...' should behave if the existing sparse-checkout file does not match the cone mode patterns. Change the behavior to fail with an error message about the existing patterns. Also, all cone mode patterns start with a '/' character, so add that restriction. This is necessary for our example test 'cone mode: warn on bad pattern', but also requires modifying the example sparse-checkout file we use to test the warnings related to recognizing cone mode patterns. This error checking would cause a failure further down the test script 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 Signed-off-by: Derrick Stolee Signed-off-by: Junio C Hamano --- builtin/sparse-checkout.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'builtin/sparse-checkout.c') diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c index 9ccdcde983..6580075a63 100644 --- a/builtin/sparse-checkout.c +++ b/builtin/sparse-checkout.c @@ -598,6 +598,9 @@ static void add_patterns_cone_mode(int argc, const char **argv, die(_("unable to load existing sparse-checkout patterns")); free(sparse_filename); + if (!existing.use_cone_patterns) + die(_("existing sparse-checkout patterns do not use cone mode")); + hashmap_for_each_entry(&existing.recursive_hashmap, &iter, pe, ent) { if (!hashmap_contains_parent(&pl->recursive_hashmap, pe->pattern, &buffer) || -- cgit v1.2.3