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| author | Lukas Larsson <[email protected]> | 2018-12-05 12:21:05 +0100 |
|---|---|---|
| committer | Lukas Larsson <[email protected]> | 2018-12-05 12:22:17 +0100 |
| commit | f9dab18e922c00e51b945da2052cd513d3cd39df (patch) | |
| tree | 7f2f2ccc798ebb65c4626c5f6167fdbabdb692e9 /erts/emulator/drivers | |
| parent | f37c8b37f49034fe10898ea47ed9c043ad2ba173 (diff) | |
| download | otp-f9dab18e922c00e51b945da2052cd513d3cd39df.tar.gz otp-f9dab18e922c00e51b945da2052cd513d3cd39df.tar.bz2 otp-f9dab18e922c00e51b945da2052cd513d3cd39df.zip | |
erts: Fix inet pktopts on very old linux kernels
Diffstat (limited to 'erts/emulator/drivers')
| -rw-r--r-- | erts/emulator/drivers/common/inet_drv.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c index 4c1ab90c01..44b0dcea1d 100644 --- a/erts/emulator/drivers/common/inet_drv.c +++ b/erts/emulator/drivers/common/inet_drv.c @@ -633,9 +633,13 @@ static size_t my_strnlen(const char *s, size_t maxlen) * header length. To get the header length we use * the pointer difference from the cmsg start pointer * to the CMSG_DATA(cmsg) pointer. + * + * Some platforms (seen on ppc Linux 2.6.29-3.ydl61.3) + * may return 0 as the cmsg_len if the cmsg is to be ignored. */ #define LEN_CMSG_DATA(cmsg) \ - ((cmsg)->cmsg_len - ((char*)CMSG_DATA(cmsg) - (char*)(cmsg))) + ((cmsg)->cmsg_len < sizeof (struct cmsghdr) ? 0 : \ + (cmsg)->cmsg_len - ((char*)CMSG_DATA(cmsg) - (char*)(cmsg))) #define NXT_CMSG_HDR(cmsg) \ ((struct cmsghdr*)(((char*)(cmsg)) + CMSG_SPACE(LEN_CMSG_DATA(cmsg)))) #endif |