From: Zhihao Cheng <chengzhihao1@huawei.com> mainline inclusion from mainline-v5.11-rc1 commit c8be097530a82e004f98378c3afc5cd35efc4f57 category: bugfix bugzilla: 182885 https://gitee.com/openeuler/kernel/issues/I4DDEL Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ----------------------------------------------- This reverts commit acc5af3efa30 ("ubifs: Fix out-of-bounds memory access caused by abnormal value of node_len") No need to avoid memory oob in dumping for data node alone. Later, node length will be passed into function 'ubifs_dump_node()' which replaces all node dumping places. Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- fs/ubifs/io.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c index eae9cf5a57b0..d71aabd992fe 100644 --- a/fs/ubifs/io.c +++ b/fs/ubifs/io.c @@ -225,7 +225,7 @@ int ubifs_is_mapped(const struct ubifs_info *c, int lnum) int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, int offs, int quiet, int must_chk_crc) { - int err = -EINVAL, type, node_len, dump_node = 1; + int err = -EINVAL, type, node_len; uint32_t crc, node_crc, magic; const struct ubifs_ch *ch = buf; @@ -278,22 +278,10 @@ int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, out_len: if (!quiet) ubifs_err(c, "bad node length %d", node_len); - if (type == UBIFS_DATA_NODE && node_len > UBIFS_DATA_NODE_SZ) - dump_node = 0; out: if (!quiet) { ubifs_err(c, "bad node at LEB %d:%d", lnum, offs); - if (dump_node) { - ubifs_dump_node(c, buf); - } else { - int safe_len = min3(node_len, c->leb_size - offs, - (int)UBIFS_MAX_DATA_NODE_SZ); - pr_err("\tprevent out-of-bounds memory access\n"); - pr_err("\ttruncated data node length %d\n", safe_len); - pr_err("\tcorrupted data node:\n"); - print_hex_dump(KERN_ERR, "\t", DUMP_PREFIX_OFFSET, 32, 1, - buf, safe_len, 0); - } + ubifs_dump_node(c, buf); dump_stack(); } return err; -- 2.20.1