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linux-user: Check lock_user result for ip_mreq_source sockopts 

In do_setsockopt(), the code path for the options which take a struct
ip_mreq_source (IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE,
IP_ADD_SOURCE_MEMBERSHIP and IP_DROP_SOURCE_MEMBERSHIP) fails to
check the return value from lock_user().  Handle this in the usual
way by returning -TARGET_EFAULT.

(In practice this was probably harmless because we'd pass a NULL
pointer to setsockopt() and the kernel would then return EFAULT.)

Fixes: Coverity CID 1459987
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210809155424.30968-1-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Peter Maydell 2021-08-09 16:54:24 +01:00 committed by Laurent Vivier
parent d0a7920eb4
commit 74e43b04b0
1 changed files with 3 additions and 0 deletions
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3
linux-user/syscall.c
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@ -2127,6 +2127,9 @@ static abi_long do_setsockopt(int sockfd, int level, int optname,
return -TARGET_EINVAL;
ip_mreq_source = lock_user(VERIFY_READ, optval_addr, optlen, 1);
if (!ip_mreq_source) {
return -TARGET_EFAULT;
}
ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq_source, optlen));
unlock_user (ip_mreq_source, optval_addr, 0);
break;