[PATCH v2 01/15] reftable/stack: fix error handling in `reftable_stack_init_addition()`
- From
Patrick Steinhardt <ps@pks.im>
- Date
- Mar 25, 2024, 10:02 UTC
- Message-ID
- <b41b9b27cb8a7f7865cd9e128cb31d2a1a2e5cc5.1711360631.git.ps@pks.im>
- In-Reply-To
- <cover.1711360631.git.ps@pks.im>
In `reftable_stack_init_addition()` we call `stack_uptodate()` after having created the lockfile to check whether the stack was modified concurrently, which is indicated by a positive return code from the latter function. If so, we return a `REFTABLE_LOCK_ERROR` to the caller and abort the addition.
The error handling has an off-by-one though because we check whether the error code is `> 1` instead of `> 0`. Thus, instead of returning the locking error, we would return a positive value. One of the callers of `reftable_stack_init_addition()` works around this bug by repeating the error code check without the off-by-one. But other callers are subtly broken by this bug.
Fix this by checking for `err > 0` instead. This has the consequence that `reftable_stack_init_addition()` won't ever return a positive error code anymore, but will instead return `REFTABLE_LOCK_ERROR` now. Thus, we can drop the check for a positive error code in `stack_try_add()` now.
Signed-off-by: Patrick Steinhardt <ps@pks.im> --- reftable/stack.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/reftable/stack.c b/reftable/stack.c index 1ecf1b9751..92d9a7facb 100644 --- a/reftable/stack.c +++ b/reftable/stack.c @@ -590,8 +590,7 @@ static int reftable_stack_init_addition(struct reftable_addition *add, err = stack_uptodate(st); if (err < 0) goto done; - - if (err > 1) { + if (err > 0) { err = REFTABLE_LOCK_ERROR; goto done; } @@ -713,10 +712,6 @@ static int stack_try_add(struct reftable_stack *st, int err = reftable_stack_init_addition(&add, st); if (err < 0) goto done; - if (err > 0) { - err = REFTABLE_LOCK_ERROR; - goto done; - } err = reftable_addition_add(&add, write_table, arg); if (err < 0)
-- 2.44.GIT