Commit 595b2a42 authored by Rich Salz's avatar Rich Salz
Browse files

Check fflush on BIO_ctrl call 



Bug found and fix suggested by Julian Rüth.
Push error if fflush fails

Reviewed-by: default avatarRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3266)
parent 5cc97761

crypto/bio/bss_file.c

+9 −4
Original line number Diff line number Diff line
@@ -190,6 +190,7 @@ static long file_ctrl(BIO *b, int cmd, long num, void *ptr) 
    FILE *fp = (FILE *)b->ptr;

    FILE **fpp;

    char p[4];

    int st;



    switch (cmd) {

    case BIO_C_FILE_SEEK:
@@ -317,10 +318,14 @@ static long file_ctrl(BIO *b, int cmd, long num, void *ptr) 
        b->shutdown = (int)num;

        break;

    case BIO_CTRL_FLUSH:

        if (b->flags & BIO_FLAGS_UPLINK)

            UP_fflush(b->ptr);

        else

            fflush((FILE *)b->ptr);

        st = b->flags & BIO_FLAGS_UPLINK

                ? UP_fflush(b->ptr) : fflush((FILE *)b->ptr);

        if (st == EOF) {

            SYSerr(SYS_F_FFLUSH, get_last_sys_error());

            ERR_add_error_data(1, "fflush()");

            BIOerr(BIO_F_FILE_CTRL, ERR_R_SYS_LIB);

            ret = 0;

        }

        break;

    case BIO_CTRL_DUP:

        ret = 1;

crypto/err/err.c

+1 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ static ERR_STRING_DATA ERR_str_functs[] = { 
    {ERR_PACK(0, SYS_F_GETSOCKOPT, 0), "getsockopt"},

    {ERR_PACK(0, SYS_F_GETSOCKNAME, 0), "getsockname"},

    {ERR_PACK(0, SYS_F_GETHOSTBYNAME, 0), "gethostbyname"},

    {ERR_PACK(0, SYS_F_FFLUSH, 0), "fflush"},

    {0, NULL},

};

include/openssl/err.h

+1 −0
Original line number Diff line number Diff line
@@ -159,6 +159,7 @@ typedef struct err_state_st { 
# define SYS_F_GETSOCKOPT        15

# define SYS_F_GETSOCKNAME       16

# define SYS_F_GETHOSTBYNAME     17

# define SYS_F_FFLUSH            18



/* reasons */

# define ERR_R_SYS_LIB   ERR_LIB_SYS/* 2 */