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63 lines
1.9 KiB
Diff
63 lines
1.9 KiB
Diff
From 80fc9e43a7975ab70442ff5f94b3c6a0c3570661 Mon Sep 17 00:00:00 2001
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From: Chao Yu <chao@kernel.org>
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Date: Fri, 30 Dec 2022 23:43:32 +0800
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Subject: [PATCH] f2fs: fix to avoid NULL pointer dereference in
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f2fs_issue_flush()
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commit b3d83066cbebc76dbac8a5fca931f64b4c6fff34 upstream.
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With below two cases, it will cause NULL pointer dereference when
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accessing SM_I(sbi)->fcc_info in f2fs_issue_flush().
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a) If kthread_run() fails in f2fs_create_flush_cmd_control(), it will
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release SM_I(sbi)->fcc_info,
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- mount -o noflush_merge /dev/vda /mnt/f2fs
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- mount -o remount,flush_merge /dev/vda /mnt/f2fs -- kthread_run() fails
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- dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=1 conv=fsync
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b) we will never allocate memory for SM_I(sbi)->fcc_info w/ below
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testcase,
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- mount -o ro /dev/vda /mnt/f2fs
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- mount -o rw,remount /dev/vda /mnt/f2fs
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- dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=1 conv=fsync
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In order to fix this issue, let change as below:
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- fix error path handling in f2fs_create_flush_cmd_control().
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- allocate SM_I(sbi)->fcc_info even if readonly is on.
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Signed-off-by: Chao Yu <chao@kernel.org>
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Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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---
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fs/f2fs/segment.c | 12 ++++--------
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1 file changed, 4 insertions(+), 8 deletions(-)
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--- a/fs/f2fs/segment.c
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+++ b/fs/f2fs/segment.c
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@@ -663,9 +663,7 @@ init_thread:
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"f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
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if (IS_ERR(fcc->f2fs_issue_flush)) {
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err = PTR_ERR(fcc->f2fs_issue_flush);
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- kfree(fcc);
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- SM_I(sbi)->fcc_info = NULL;
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- return err;
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+ fcc->f2fs_issue_flush = NULL;
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}
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return err;
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@@ -5062,11 +5060,9 @@ int f2fs_build_segment_manager(struct f2
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init_f2fs_rwsem(&sm_info->curseg_lock);
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- if (!f2fs_readonly(sbi->sb)) {
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- err = f2fs_create_flush_cmd_control(sbi);
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- if (err)
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- return err;
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- }
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+ err = f2fs_create_flush_cmd_control(sbi);
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+ if (err)
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+ return err;
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err = create_discard_cmd_control(sbi);
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if (err)
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