This is a note to let you know that I've just added the patch titled
ext4: drop the call to ext4_error() from ext4_get_group_info()
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-drop-the-call-to-ext4_error-from-ext4_get_group.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5311501d73d303c1fbf779aaaf9406b0914ae4a1
Author: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
Date: Wed Jun 14 12:02:55 2023 +0200
ext4: drop the call to ext4_error() from ext4_get_group_info()
[ Upstream commit f451fd97dd2b78f286379203a47d9d295c467255 ]
A recent patch added a call to ext4_error() which is problematic since
some callers of the ext4_get_group_info() function may be holding a
spinlock, whereas ext4_error() must never be called in atomic context.
This triggered a report from Syzbot: "BUG: sleeping function called from
invalid context in ext4_update_super" (see the link below).
Therefore, drop the call to ext4_error() from ext4_get_group_info(). In
the meantime use eight characters tabs instead of nine characters ones.
Reported-by: syzbot+4acc7d910e617b360859@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lore.kernel.org/all/00000000000070575805fdc6cdb2@xxxxxxxxxx/
Fixes: 5354b2af3406 ("ext4: allow ext4_get_group_info() to fail")
Suggested-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230614100446.14337-1-fmdefrancesco@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index a38aa33af08ef..8e83b51e3c68a 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -322,17 +322,15 @@ static ext4_fsblk_t ext4_valid_block_bitmap_padding(struct super_block *sb,
struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
ext4_group_t group)
{
- struct ext4_group_info **grp_info;
- long indexv, indexh;
-
- if (unlikely(group >= EXT4_SB(sb)->s_groups_count)) {
- ext4_error(sb, "invalid group %u", group);
- return NULL;
- }
- indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
- indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
- grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
- return grp_info[indexh];
+ struct ext4_group_info **grp_info;
+ long indexv, indexh;
+
+ if (unlikely(group >= EXT4_SB(sb)->s_groups_count))
+ return NULL;
+ indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
+ indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
+ grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
+ return grp_info[indexh];
}
/*
