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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2 15/15] fs: error out when writing on read-only file system
Date: Fri, 30 Apr 2021 15:29:49 +0200	[thread overview]
Message-ID: <20210430132949.14617-16-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20210430132949.14617-1-a.fatoum@pengutronix.de>

On an ext4 partition, Running

  echo -a /mnt/disk0.0/file test

will crash barebox because fsdrv->truncate in __write is NULL.

Don't let it come to this and verify earlier that the FS implements
->write. While at it, explicitly compare with O_RDONLY (== 0) for
clarity.

Fixes: b3fbfad7aeaf ("fs: dentry cache implementation")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 fs/fs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/fs.c b/fs/fs.c
index a023324913c4..881dc2fca0ce 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -321,13 +321,13 @@ static ssize_t __write(FILE *f, const void *buf, size_t count)
 	struct fs_driver_d *fsdrv;
 	int ret;
 
-	if (!(f->flags & O_ACCMODE)) {
+	fsdrv = f->fsdev->driver;
+
+	if ((f->flags & O_ACCMODE) == O_RDONLY || !fsdrv->write) {
 		ret = -EBADF;
 		goto out;
 	}
 
-	fsdrv = f->fsdev->driver;
-
 	if (fsdrv != ramfs_driver)
 		assert_command_context();
 
-- 
2.29.2


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      parent reply	other threads:[~2021-04-30 13:31 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-30 13:29 [PATCH v2 00/15] USB: gadget: refactor to allow easier extension Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 01/15] show_progress: add system wide progress stage notifier Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 02/15] common: console: add log_writefile to write log into new file Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 03/15] string: implement strstarts along with strends Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 04/15] vsprintf: introduce %m shorthand for "%s", strerror(errno) Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 05/15] param: introduce file-list parameter type Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 06/15] common: add generic system partitions interface Ahmad Fatoum
2021-04-30 13:39   ` [PATCH] fixup! " Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 07/15] fastboot: handle ill-named partitions gracefully Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 08/15] usb: gadget: dfu: change status message to info log level Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 09/15] usbgadget: autostart: fix indeterminism around usbgadget.autostart Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 10/15] usbgadget: allow DFU and Fastboot functions to coexist Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 11/15] fastboot/dfu: use system partitions as fall back Ahmad Fatoum
2021-04-30 17:57   ` [PATCH] fixup! " Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 12/15] bbu: add function to directly add handlers into file_list Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 13/15] file_list: add file_list_detect_all() Ahmad Fatoum
2021-04-30 13:29 ` [PATCH v2 14/15] common: make FILE_LIST feature unconditional Ahmad Fatoum
2021-04-30 13:29 ` Ahmad Fatoum [this message]

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