[PATCH 07/16] dlm: validate data in dlm_recover_directory()
From: Al Viro <[EMAIL PROTECTED]> Signed-off-by: Al Viro <[EMAIL PROTECTED]> Signed-off-by: David Teigland <[EMAIL PROTECTED]> --- fs/dlm/dir.c | 23 --- 1 files changed, 20 insertions(+), 3 deletions(-) diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c index ce30136..831050e 100644 --- a/fs/dlm/dir.c +++ b/fs/dlm/dir.c @@ -220,6 +220,7 @@ int dlm_recover_directory(struct dlm_ls *ls) last_len = 0; for (;;) { + int left; error = dlm_recovery_stopped(ls); if (error) goto out_free; @@ -236,11 +237,20 @@ int dlm_recover_directory(struct dlm_ls *ls) */ b = ls->ls_recover_buf->rc_buf; + left = ls->ls_recover_buf->rc_header.h_length; + left -= sizeof(struct dlm_rcom); for (;;) { - memcpy(, b, sizeof(uint16_t)); - namelen = be16_to_cpu(namelen); - b += sizeof(uint16_t); + __be16 v; + + error = -EINVAL; + if (left < sizeof(__be16)) + goto out_free; + + memcpy(, b, sizeof(__be16)); + namelen = be16_to_cpu(v); + b += sizeof(__be16); + left -= sizeof(__be16); /* namelen of 0xF marks end of names for this node; namelen of 0 marks end of the @@ -251,6 +261,12 @@ int dlm_recover_directory(struct dlm_ls *ls) if (!namelen) break; + if (namelen > left) + goto out_free; + + if (namelen > DLM_RESNAME_MAXLEN) + goto out_free; + error = -ENOMEM; de = get_free_de(ls, namelen); if (!de) @@ -262,6 +278,7 @@ int dlm_recover_directory(struct dlm_ls *ls) memcpy(de->name, b, namelen); memcpy(last_name, b, namelen); b += namelen; + left -= namelen; add_entry_to_hash(ls, de); count++; -- 1.5.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH 07/16] dlm: validate data in dlm_recover_directory()
From: Al Viro [EMAIL PROTECTED] Signed-off-by: Al Viro [EMAIL PROTECTED] Signed-off-by: David Teigland [EMAIL PROTECTED] --- fs/dlm/dir.c | 23 --- 1 files changed, 20 insertions(+), 3 deletions(-) diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c index ce30136..831050e 100644 --- a/fs/dlm/dir.c +++ b/fs/dlm/dir.c @@ -220,6 +220,7 @@ int dlm_recover_directory(struct dlm_ls *ls) last_len = 0; for (;;) { + int left; error = dlm_recovery_stopped(ls); if (error) goto out_free; @@ -236,11 +237,20 @@ int dlm_recover_directory(struct dlm_ls *ls) */ b = ls-ls_recover_buf-rc_buf; + left = ls-ls_recover_buf-rc_header.h_length; + left -= sizeof(struct dlm_rcom); for (;;) { - memcpy(namelen, b, sizeof(uint16_t)); - namelen = be16_to_cpu(namelen); - b += sizeof(uint16_t); + __be16 v; + + error = -EINVAL; + if (left sizeof(__be16)) + goto out_free; + + memcpy(v, b, sizeof(__be16)); + namelen = be16_to_cpu(v); + b += sizeof(__be16); + left -= sizeof(__be16); /* namelen of 0xF marks end of names for this node; namelen of 0 marks end of the @@ -251,6 +261,12 @@ int dlm_recover_directory(struct dlm_ls *ls) if (!namelen) break; + if (namelen left) + goto out_free; + + if (namelen DLM_RESNAME_MAXLEN) + goto out_free; + error = -ENOMEM; de = get_free_de(ls, namelen); if (!de) @@ -262,6 +278,7 @@ int dlm_recover_directory(struct dlm_ls *ls) memcpy(de-name, b, namelen); memcpy(last_name, b, namelen); b += namelen; + left -= namelen; add_entry_to_hash(ls, de); count++; -- 1.5.3.3 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/