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| author | Khem Raj <raj.khem@gmail.com> | 2021-07-02 13:28:10 -0700 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-07-05 15:11:13 -0300 |
| commit | c8935581de4ff931bc32fb03da5d87f0ee2378a1 (patch) | |
| tree | 619b72365133737f7df6c671f10443cc21d35789 /sysdeps | |
| parent | 91fb0f17a5779da6e7877eb74119a83dbe8bf167 (diff) | |
| download | glibc-c8935581de4ff931bc32fb03da5d87f0ee2378a1.zip glibc-c8935581de4ff931bc32fb03da5d87f0ee2378a1.tar.gz glibc-c8935581de4ff931bc32fb03da5d87f0ee2378a1.tar.bz2 | |
linux: Check for null value msghdr struct before use
This avoids crashes in libc when cmsg is null and refrencing msg
structure when it is null
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/convert_scm_timestamps.c | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/recvmsg.c | 4 |
2 files changed, 4 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/convert_scm_timestamps.c b/sysdeps/unix/sysv/linux/convert_scm_timestamps.c index d75a461..5af7184 100644 --- a/sysdeps/unix/sysv/linux/convert_scm_timestamps.c +++ b/sysdeps/unix/sysv/linux/convert_scm_timestamps.c @@ -87,6 +87,8 @@ __convert_scm_timestamps (struct msghdr *msg, socklen_t msgsize) msg->msg_controllen += CMSG_SPACE (sizeof tvts); cmsg = CMSG_NXTHDR(msg, last); + if (cmsg == NULL) + return; cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = type; cmsg->cmsg_len = CMSG_LEN (sizeof tvts); diff --git a/sysdeps/unix/sysv/linux/recvmsg.c b/sysdeps/unix/sysv/linux/recvmsg.c index a2a6002..57c3cf7 100644 --- a/sysdeps/unix/sysv/linux/recvmsg.c +++ b/sysdeps/unix/sysv/linux/recvmsg.c @@ -25,7 +25,7 @@ __libc_recvmsg (int fd, struct msghdr *msg, int flags) { ssize_t r; #ifndef __ASSUME_TIME64_SYSCALLS - socklen_t orig_controllen = msg->msg_controllen; + socklen_t orig_controllen = msg != NULL ? msg->msg_controllen : 0; #endif #ifdef __ASSUME_RECVMSG_SYSCALL @@ -35,7 +35,7 @@ __libc_recvmsg (int fd, struct msghdr *msg, int flags) #endif #ifndef __ASSUME_TIME64_SYSCALLS - if (r >= 0) + if (r >= 0 && orig_controllen != 0) __convert_scm_timestamps (msg, orig_controllen); #endif |