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usb: gadget: configfs: Prevent OOB read/write in usb_string_copy()

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commit 6d3c721e686ea6c59e18289b400cc95c76e927e0 upstream.

Userspace provided string 's' could trivially have the length zero. Left
unchecked this will firstly result in an OOB read in the form
`if (str[0 - 1] == '\n') followed closely by an OOB write in the form
`str[0 - 1] = '\0'`.

There is already a validating check to catch strings that are too long.
Let's supply an additional check for invalid strings that are too short.

Signed-off-by: Lee Jones <lee@kernel.org>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20240705074339.633717-1-lee@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit a444c3fc264119801575ab086e03fb4952f23fd0)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Lee Jones 2024-07-05 08:43:39 +01:00 committed by Vegard Nossum
parent af79b0b199
commit 4a1cba1a65
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/gadget/configfs.c
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@ -115,9 +115,12 @@ static int usb_string_copy(const char *s, char **s_copy)
int ret;
char *str;
char *copy = *s_copy;
ret = strlen(s);
if (ret > USB_MAX_STRING_LEN)
return -EOVERFLOW;
if (ret < 1)
return -EINVAL;
if (copy) {
str = copy;