From 83856aacbade28e8b6b48da6e93c935f89d245f0 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Mon, 15 Nov 2021 19:42:04 +0800 Subject: [PATCH] ext2: fix sleeping in atomic bugs on error stable inclusion from stable-5.10.72 commit 76c7063c7405f30758876af25cfc5e9e39b7bc6e bugzilla: 182982 https://gitee.com/openeuler/kernel/issues/I4I3L1 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=76c7063c7405f30758876af25cfc5e9e39b7bc6e -------------------------------- [ Upstream commit 372d1f3e1bfede719864d0d1fbf3146b1e638c88 ] The ext2_error() function syncs the filesystem so it sleeps. The caller is holding a spinlock so it's not allowed to sleep. ext2_statfs() <- disables preempt -> ext2_count_free_blocks() -> ext2_get_group_desc() Fix this by using WARN() to print an error message and a stack trace instead of using ext2_error(). Link: https://lore.kernel.org/r/20210921203233.GA16529@kili Signed-off-by: Dan Carpenter Signed-off-by: Jan Kara Signed-off-by: Sasha Levin Signed-off-by: Chen Jun Acked-by: Weilong Chen Signed-off-by: Chen Jun Signed-off-by: Zheng Zengkai --- fs/ext2/balloc.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c index 1f3f4326bf3c..c17ccc19b938 100644 --- a/fs/ext2/balloc.c +++ b/fs/ext2/balloc.c @@ -48,10 +48,9 @@ struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, struct ext2_sb_info *sbi = EXT2_SB(sb); if (block_group >= sbi->s_groups_count) { - ext2_error (sb, "ext2_get_group_desc", - "block_group >= groups_count - " - "block_group = %d, groups_count = %lu", - block_group, sbi->s_groups_count); + WARN(1, "block_group >= groups_count - " + "block_group = %d, groups_count = %lu", + block_group, sbi->s_groups_count); return NULL; } @@ -59,10 +58,9 @@ struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, group_desc = block_group >> EXT2_DESC_PER_BLOCK_BITS(sb); offset = block_group & (EXT2_DESC_PER_BLOCK(sb) - 1); if (!sbi->s_group_desc[group_desc]) { - ext2_error (sb, "ext2_get_group_desc", - "Group descriptor not loaded - " - "block_group = %d, group_desc = %lu, desc = %lu", - block_group, group_desc, offset); + WARN(1, "Group descriptor not loaded - " + "block_group = %d, group_desc = %lu, desc = %lu", + block_group, group_desc, offset); return NULL; } -- GitLab