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bcachefs: add check NULL return of bio_kmalloc in journal_read_bucket

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bio_kmalloc may return NULL, will cause NULL pointer dereference.
Add check NULL return for bio_kmalloc in journal_read_bucket.

Signed-off-by: Pei Xiao <xiaopei01@kylinos.cn>
Fixes: ac10a9611d ("bcachefs: Some fixes for building in userspace")
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Pei Xiao 2024-10-30 15:48:01 +08:00 committed by Kent Overstreet
parent ef4f6c322b
commit 93d53f1caf
2 changed files with 3 additions and 0 deletions
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1
fs/bcachefs/errcode.h
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@ -84,6 +84,7 @@
x(ENOMEM, ENOMEM_dev_alloc) \
x(ENOMEM, ENOMEM_disk_accounting) \
x(ENOMEM, ENOMEM_stripe_head_alloc) \
x(ENOMEM, ENOMEM_journal_read_bucket) \
x(ENOSPC, ENOSPC_disk_reservation) \
x(ENOSPC, ENOSPC_bucket_alloc) \
x(ENOSPC, ENOSPC_disk_label_add) \

2
fs/bcachefs/journal_io.c
View File

@ -1012,6 +1012,8 @@ reread:
nr_bvecs = buf_pages(buf->data, sectors_read << 9);
bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
if (!bio)
return -BCH_ERR_ENOMEM_journal_read_bucket;
bio_init(bio, ca->disk_sb.bdev, bio->bi_inline_vecs, nr_bvecs, REQ_OP_READ);
bio->bi_iter.bi_sector = offset;