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Message-ID: <20240916210310.14014-1-pvmohammedanees2003@gmail.com>
Date: Mon, 16 Sep 2024 21:03:10 +0000
From: Mohammed Anees <pvmohammedanees2003@...il.com>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: linux-bcachefs@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mohammed Anees <pvmohammedanees2003@...il.com>,
syzbot+37186860aa7812b331d5@...kaller.appspotmail.com
Subject: [PATCH] bcachefs: Fix NULL pointer dereference in bch2_opt_to_text
syzbot has found an general protection fault in prt_str [1].
In the prt_str function, a NULL pointer dereference occurs when the
parameter str is NULL, which is called in bch2_opt_to_text when
opt->type is BCH_OPT_STR. If an invalid index v or incorrect
flag is passed to ptr_str, then this could lead to this issue.
[1] https://syzkaller.appspot.com/bug?extid=37186860aa7812b331d5
Reported-and-tested-by: syzbot+37186860aa7812b331d5@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=37186860aa7812b331d5
Signed-off-by: Mohammed Anees <pvmohammedanees2003@...il.com>
---
fs/bcachefs/opts.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/bcachefs/opts.c b/fs/bcachefs/opts.c
index e10fc1da7..72b87251c 100644
--- a/fs/bcachefs/opts.c
+++ b/fs/bcachefs/opts.c
@@ -420,8 +420,12 @@ void bch2_opt_to_text(struct printbuf *out,
case BCH_OPT_STR:
if (flags & OPT_SHOW_FULL_LIST)
prt_string_option(out, opt->choices, v);
- else
- prt_str(out, opt->choices[v]);
+ else {
+ if (opt->choices[v] == NULL)
+ pr_err("Invalid flags or index v passed to the function\n");
+ else
+ prt_str(out, opt->choices[v]);
+ }
break;
case BCH_OPT_FN:
opt->fn.to_text(out, c, sb, v);
--
2.46.0
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