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| author | Jamie Hill-Daniel <jamie@hill-daniel.co.uk> | 2022-01-18 10:06:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-20 11:13:14 +0300 |
| commit | e192ccc17ecf3e78a1c6fb81badf9b50bd791115 (patch) | |
| tree | 9c8aabb69808a751530c18f9d675634c67cad949 /fs/fs_context.c | |
| parent | c78c39a91dd4aa8a622a3300391e1f2bd5b33549 (diff) | |
| download | linux-e192ccc17ecf3e78a1c6fb81badf9b50bd791115.tar.xz | |
vfs: fs_context: fix up param length parsing in legacy_parse_param
commit 722d94847de29310e8aa03fcbdb41fc92c521756 upstream.
The "PAGE_SIZE - 2 - size" calculation in legacy_parse_param() is an
unsigned type so a large value of "size" results in a high positive
value instead of a negative value as expected. Fix this by getting rid
of the subtraction.
Signed-off-by: Jamie Hill-Daniel <jamie@hill-daniel.co.uk>
Signed-off-by: William Liu <willsroot@protonmail.com>
Tested-by: Salvatore Bonaccorso <carnil@debian.org>
Tested-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/fs_context.c')
| -rw-r--r-- | fs/fs_context.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/fs_context.c b/fs/fs_context.c index b7e43a780a62..24ce12f0db32 100644 --- a/fs/fs_context.c +++ b/fs/fs_context.c @@ -548,7 +548,7 @@ static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param) param->key); } - if (len > PAGE_SIZE - 2 - size) + if (size + len + 2 > PAGE_SIZE) return invalf(fc, "VFS: Legacy: Cumulative options too large"); if (strchr(param->key, ',') || (param->type == fs_value_is_string && |