[PATCH v4 06/25] reftable/record: handle allocation failures on copy
- From
Patrick Steinhardt <ps@pks.im>
- Date
- Oct 1, 2024, 09:42 UTC
- Message-ID
- <756a32c28558bfaa360304712110443d643fc303.1727774935.git.ps@pks.im>
- In-Reply-To
- <cover.1727774935.git.ps@pks.im>
Handle allocation failures when copying records. While at it, convert from `xstrdup()` to `reftable_strdup()`. Adapt callsites to check for error codes.
Signed-off-by: Patrick Steinhardt <ps@pks.im> --- reftable/record.c | 84 +++++++++++++++++++++++++++++++++-------------- reftable/record.h | 6 ++-- 2 files changed, 63 insertions(+), 27 deletions(-)
diff --git a/reftable/record.c b/reftable/record.c index 6b5a075b92..60fd33c9c9 100644 --- a/reftable/record.c +++ b/reftable/record.c @@ -215,13 +215,14 @@ static void reftable_ref_record_key(const void *r, struct strbuf *dest) strbuf_addstr(dest, rec->refname); } -static void reftable_ref_record_copy_from(void *rec, const void *src_rec, - int hash_size) +static int reftable_ref_record_copy_from(void *rec, const void *src_rec, + int hash_size) { struct reftable_ref_record *ref = rec; const struct reftable_ref_record *src = src_rec; char *refname = NULL; size_t refname_cap = 0; + int err; assert(hash_size > 0); @@ -236,6 +237,11 @@ static void reftable_ref_record_copy_from(void *rec, const void *src_rec, REFTABLE_ALLOC_GROW(ref->refname, refname_len + 1, ref->refname_cap); + if (!ref->refname) { + err = REFTABLE_OUT_OF_MEMORY_ERROR; + goto out; + } + memcpy(ref->refname, src->refname, refname_len); ref->refname[refname_len] = 0; } @@ -254,9 +260,17 @@ static void reftable_ref_record_copy_from(void *rec, const void *src_rec, src->value.val2.target_value, hash_size); break; case REFTABLE_REF_SYMREF: - ref->value.symref = xstrdup(src->value.symref); + ref->value.symref = reftable_strdup(src->value.symref); + if (!ref->value.symref) { + err = REFTABLE_OUT_OF_MEMORY_ERROR; + goto out; + } break; } + + err = 0; +out: + return err; } static void reftable_ref_record_release_void(void *rec) @@ -457,23 +471,28 @@ static void reftable_obj_record_release(void *rec) memset(obj, 0, sizeof(struct reftable_obj_record)); } -static void reftable_obj_record_copy_from(void *rec, const void *src_rec, - int hash_size UNUSED) +static int reftable_obj_record_copy_from(void *rec, const void *src_rec, + int hash_size UNUSED) { struct reftable_obj_record *obj = rec; - const struct reftable_obj_record *src = - (const struct reftable_obj_record *)src_rec; + const struct reftable_obj_record *src = src_rec; reftable_obj_record_release(obj); REFTABLE_ALLOC_ARRAY(obj->hash_prefix, src->hash_prefix_len); + if (!obj->hash_prefix) + return REFTABLE_OUT_OF_MEMORY_ERROR; obj->hash_prefix_len = src->hash_prefix_len; if (src->hash_prefix_len) memcpy(obj->hash_prefix, src->hash_prefix, obj->hash_prefix_len); REFTABLE_ALLOC_ARRAY(obj->offsets, src->offset_len); + if (!obj->offsets) + return REFTABLE_OUT_OF_MEMORY_ERROR; obj->offset_len = src->offset_len; COPY_ARRAY(obj->offsets, src->offsets, src->offset_len); + + return 0; } static uint8_t reftable_obj_record_val_type(const void *rec) @@ -646,33 +665,44 @@ static void reftable_log_record_key(const void *r, struct strbuf *dest) strbuf_add(dest, i64, sizeof(i64)); } -static void reftable_log_record_copy_from(void *rec, const void *src_rec, - int hash_size) +static int reftable_log_record_copy_from(void *rec, const void *src_rec, + int hash_size) { struct reftable_log_record *dst = rec; const struct reftable_log_record *src = (const struct reftable_log_record *)src_rec; + int ret; reftable_log_record_release(dst); *dst = *src; + if (dst->refname) { - dst->refname = xstrdup(dst->refname); + dst->refname = reftable_strdup(dst->refname); + if (!dst->refname) { + ret = REFTABLE_OUT_OF_MEMORY_ERROR; + goto out; + } } + switch (dst->value_type) { case REFTABLE_LOG_DELETION: break; case REFTABLE_LOG_UPDATE: - if (dst->value.update.email) { + if (dst->value.update.email) dst->value.update.email = - xstrdup(dst->value.update.email); - } - if (dst->value.update.name) { + reftable_strdup(dst->value.update.email); + if (dst->value.update.name) dst->value.update.name = - xstrdup(dst->value.update.name); - } - if (dst->value.update.message) { + reftable_strdup(dst->value.update.name); + if (dst->value.update.message) dst->value.update.message = - xstrdup(dst->value.update.message); + reftable_strdup(dst->value.update.message); + + if (!dst->value.update.email || + !dst->value.update.name || + !dst->value.update.message) { + ret = REFTABLE_OUT_OF_MEMORY_ERROR; + goto out; } memcpy(dst->value.update.new_hash, @@ -681,6 +711,10 @@ static void reftable_log_record_copy_from(void *rec, const void *src_rec, src->value.update.old_hash, hash_size); break; } + + ret = 0; +out: + return ret; } static void reftable_log_record_release_void(void *rec) @@ -954,8 +988,8 @@ static void reftable_index_record_key(const void *r, struct strbuf *dest) strbuf_addbuf(dest, &rec->last_key); } -static void reftable_index_record_copy_from(void *rec, const void *src_rec, - int hash_size UNUSED) +static int reftable_index_record_copy_from(void *rec, const void *src_rec, + int hash_size UNUSED) { struct reftable_index_record *dst = rec; const struct reftable_index_record *src = src_rec; @@ -963,6 +997,8 @@ static void reftable_index_record_copy_from(void *rec, const void *src_rec, strbuf_reset(&dst->last_key); strbuf_addbuf(&dst->last_key, &src->last_key); dst->offset = src->offset; + + return 0; } static void reftable_index_record_release(void *rec) @@ -1054,14 +1090,14 @@ int reftable_record_encode(struct reftable_record *rec, struct string_view dest, dest, hash_size); } -void reftable_record_copy_from(struct reftable_record *rec, +int reftable_record_copy_from(struct reftable_record *rec, struct reftable_record *src, int hash_size) { assert(src->type == rec->type); - reftable_record_vtable(rec)->copy_from(reftable_record_data(rec), - reftable_record_data(src), - hash_size); + return reftable_record_vtable(rec)->copy_from(reftable_record_data(rec), + reftable_record_data(src), + hash_size); } uint8_t reftable_record_val_type(struct reftable_record *rec) diff --git a/reftable/record.h b/reftable/record.h index 5003bacdb0..0f53ba5443 100644 --- a/reftable/record.h +++ b/reftable/record.h @@ -44,7 +44,7 @@ struct reftable_record_vtable { /* The record type of ('r' for ref). */ uint8_t type; - void (*copy_from)(void *dest, const void *src, int hash_size); + int (*copy_from)(void *dest, const void *src, int hash_size); /* a value of [0..7], indicating record subvariants (eg. ref vs. symref * vs ref deletion) */ @@ -137,8 +137,8 @@ void reftable_record_init(struct reftable_record *rec, uint8_t typ); int reftable_record_cmp(struct reftable_record *a, struct reftable_record *b); int reftable_record_equal(struct reftable_record *a, struct reftable_record *b, int hash_size); void reftable_record_key(struct reftable_record *rec, struct strbuf *dest); -void reftable_record_copy_from(struct reftable_record *rec, - struct reftable_record *src, int hash_size); +int reftable_record_copy_from(struct reftable_record *rec, + struct reftable_record *src, int hash_size); uint8_t reftable_record_val_type(struct reftable_record *rec); int reftable_record_encode(struct reftable_record *rec, struct string_view dest, int hash_size);
-- 2.47.0.rc0.dirty