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btrfs: send: handle unexpected data in header buffer in begin_cmd()

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[ Upstream commit e80e3f732c ]

Change BUG_ON to a proper error handling in the unlikely case of seeing
data when the command is started. This is supposed to be reset when the
command is finished (send_cmd, send_encoded_extent).

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Sterba 2024-02-06 22:47:13 +01:00 committed by Greg Kroah-Hartman
parent 46ca3ec9b8
commit 4eb8be942e
1 changed files with 6 additions and 1 deletions
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7
fs/btrfs/send.c
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@ -777,7 +777,12 @@ static int begin_cmd(struct send_ctx *sctx, int cmd)
if (WARN_ON(!sctx->send_buf)) if (WARN_ON(!sctx->send_buf))
return -EINVAL; return -EINVAL;
BUG_ON(sctx->send_size); if (unlikely(sctx->send_size != 0)) {
btrfs_err(sctx->send_root->fs_info,
"send: command header buffer not empty cmd %d offset %llu",
cmd, sctx->send_off);
return -EINVAL;
}
sctx->send_size += sizeof(*hdr); sctx->send_size += sizeof(*hdr);
hdr = (struct btrfs_cmd_header *)sctx->send_buf; hdr = (struct btrfs_cmd_header *)sctx->send_buf;