diff mbox series

[v2,1/5] exfat: Return ENAMETOOLONG consistently for oversized paths

Message ID 20220726083929.1684-2-tiwai@suse.de (mailing list archive)
State New, archived
Headers show
Series exfat: Fixes for ENAMETOOLONG error handling | expand

Commit Message

Takashi Iwai July 26, 2022, 8:39 a.m. UTC 
LTP has a test for oversized file path renames and it expects the
return value to be ENAMETOOLONG.  However, exfat returns EINVAL
unexpectedly in some cases, hence LTP test fails.  The further
investigation indicated that the problem happens only when iocharset
isn't set to utf8.

The difference comes from that, in the case of utf8,
exfat_utf8_to_utf16() returns the error -ENAMETOOLONG directly and
it's treated as the final error code.  Meanwhile, on other iocharsets,
exfat_nls_to_ucs2() returns the max path size but it sets
NLS_NAME_OVERLEN to lossy flag instead; the caller side checks only
whether lossy flag is set or not, resulting in always -EINVAL
unconditionally.

This patch aligns the return code for both cases by checking the lossy
flag bit and returning ENAMETOOLONG when NLS_NAME_OVERLEN bit is set.

BugLink: https://bugzilla.suse.com/show_bug.cgi?id=1201725
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 fs/exfat/namei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index c6eaf7e9ea74..bcb6445eb3b3 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -462,7 +462,7 @@  static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
 		return namelen; /* return error value */
 
 	if ((lossy && !lookup) || !namelen)
-		return -EINVAL;
+		return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL;
 
 	exfat_chain_set(p_dir, ei->start_clu,
 		EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);