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fs/ntfs3: Fix invalid free in log_replay 

commit f26967b9f7 upstream.

log_read_rst() returns ENOMEM error when there is not enough memory.
In this case, if info is returned without initialization,
it attempts to kfree the uninitialized info->r_page pointer. This patch
moves the memset initialization code to before log_read_rst() is called.

Reported-by: Gerald Lee <sundaywind2004@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon 2022-05-30 18:43:01 +03:00 committed by Greg Kroah-Hartman
parent 5cfcc84bc8
commit 2aafbe9fb2
1 changed files with 3 additions and 3 deletions
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6
fs/ntfs3/fslog.c
View File

@ -1185,8 +1185,6 @@ static int log_read_rst(struct ntfs_log *log, u32 l_size, bool first,
if (!r_page)
return -ENOMEM;
memset(info, 0, sizeof(struct restart_info));
/* Determine which restart area we are looking for. */
if (first) {
vbo = 0;
@ -3791,10 +3789,11 @@ int log_replay(struct ntfs_inode *ni, bool *initialized)
if (!log)
return -ENOMEM;
memset(&rst_info, 0, sizeof(struct restart_info));
log->ni = ni;
log->l_size = l_size;
log->one_page_buf = kmalloc(page_size, GFP_NOFS);
if (!log->one_page_buf) {
err = -ENOMEM;
goto out;
@ -3842,6 +3841,7 @@ int log_replay(struct ntfs_inode *ni, bool *initialized)
if (rst_info.vbo)
goto check_restart_area;
memset(&rst_info2, 0, sizeof(struct restart_info));
err = log_read_rst(log, l_size, false, &rst_info2);
/* Determine which restart area to use. */