From 980868eb4e4db550497ba40674b5b64f2e062cd9 Mon Sep 17 00:00:00 2001 From: Dmitry Shulga Date: Sat, 5 Feb 2011 11:02:00 +0600 Subject: [PATCH] Fixed bug#57450 - mysql client enter in an infinite loop if the standard input is a directory. The problem is that mysql monitor try to read from stdin without checking input source type. The solution is to stop reading data from standard input if a call to read(2) failed. A new test case was added into mysql.test. client/my_readline.h: Data members error and truncated was added to LINE_BUFFER structure. These data members used instead of out parameters in functions batch_readline, intern_read_line. client/mysql.cc: read_and_execute() was modified: set status.exit_status to 1 when the error occured while reading the next command line in non-interactive mode. Also the value of the truncated attribute of structure LINE_BUFF is taken into account only for non-iteractive mode. client/readline.cc: intern_read_line() was modified: cancel reading from input if fill_buffer() returns -1, e.g. if call to read failed. batch_readline was modified: set the error data member of LINE_BUFFER structure to value of my_errno when system error happened during call to my_read/my_realloc. mysql-test/t/mysql.test: Test for bug#57450 was added. --- client/my_readline.h | 4 +++- client/mysql.cc | 16 ++++++++++------ client/readline.cc | 33 ++++++++++++++++++++------------- mysql-test/t/mysql.test | 6 ++++++ 4 files changed, 39 insertions(+), 20 deletions(-) diff --git a/client/my_readline.h b/client/my_readline.h index 62ad19bece9..3376fc81761 100644 --- a/client/my_readline.h +++ b/client/my_readline.h @@ -25,9 +25,11 @@ typedef struct st_line_buffer uint eof; ulong max_size; ulong read_length; /* Length of last read string */ + int error; + bool truncated; } LINE_BUFFER; extern LINE_BUFFER *batch_readline_init(ulong max_size,FILE *file); extern LINE_BUFFER *batch_readline_command(LINE_BUFFER *buffer, char * str); -extern char *batch_readline(LINE_BUFFER *buffer, bool *truncated); +extern char *batch_readline(LINE_BUFFER *buffer); extern void batch_readline_end(LINE_BUFFER *buffer); diff --git a/client/mysql.cc b/client/mysql.cc index dafe76a2401..b19aaf61e58 100644 --- a/client/mysql.cc +++ b/client/mysql.cc @@ -1872,14 +1872,13 @@ static int read_and_execute(bool interactive) ulong line_number=0; bool ml_comment= 0; COMMANDS *com; - bool truncated= 0; status.exit_status=1; - + for (;;) { if (!interactive) { - line=batch_readline(status.line_buff, &truncated); + line=batch_readline(status.line_buff); /* Skip UTF8 Byte Order Marker (BOM) 0xEFBBBF. Editors like "notepad" put this marker in @@ -1953,9 +1952,13 @@ static int read_and_execute(bool interactive) if (opt_outfile && line) fprintf(OUTFILE, "%s\n", line); } - if (!line) // End of file + // End of file or system error + if (!line) { - status.exit_status=0; + if (status.line_buff && status.line_buff->error) + status.exit_status= 1; + else + status.exit_status= 0; break; } @@ -1976,7 +1979,8 @@ static int read_and_execute(bool interactive) #endif continue; } - if (add_line(glob_buffer,line,&in_string,&ml_comment, truncated)) + if (add_line(glob_buffer, line, &in_string, &ml_comment, + status.line_buff ? status.line_buff->truncated : 0)) break; } /* if in batch mode, send last query even if it doesn't end with \g or go */ diff --git a/client/readline.cc b/client/readline.cc index b32cb71b0de..7f283502ecb 100644 --- a/client/readline.cc +++ b/client/readline.cc @@ -24,7 +24,7 @@ static bool init_line_buffer(LINE_BUFFER *buffer,File file,ulong size, ulong max_size); static bool init_line_buffer_from_string(LINE_BUFFER *buffer,char * str); static size_t fill_buffer(LINE_BUFFER *buffer); -static char *intern_read_line(LINE_BUFFER *buffer, ulong *out_length, bool *truncated); +static char *intern_read_line(LINE_BUFFER *buffer, ulong *out_length); LINE_BUFFER *batch_readline_init(ulong max_size,FILE *file) @@ -42,13 +42,12 @@ LINE_BUFFER *batch_readline_init(ulong max_size,FILE *file) } -char *batch_readline(LINE_BUFFER *line_buff, bool *truncated) +char *batch_readline(LINE_BUFFER *line_buff) { char *pos; ulong out_length; - DBUG_ASSERT(truncated != NULL); - if (!(pos=intern_read_line(line_buff,&out_length, truncated))) + if (!(pos=intern_read_line(line_buff, &out_length))) return 0; if (out_length && pos[out_length-1] == '\n') if (--out_length && pos[out_length-1] == '\r') /* Remove '\n' */ @@ -162,7 +161,10 @@ static size_t fill_buffer(LINE_BUFFER *buffer) if (!(buffer->buffer = (char*) my_realloc(buffer->buffer, buffer->bufread+1, MYF(MY_WME | MY_FAE)))) - return (uint) -1; + { + buffer->error= my_errno; + return (size_t) -1; + } buffer->start_of_line=buffer->buffer+start_offset; buffer->end=buffer->buffer+bufbytes; } @@ -177,7 +179,10 @@ static size_t fill_buffer(LINE_BUFFER *buffer) /* Read in new stuff. */ if ((read_count= my_read(buffer->file, (uchar*) buffer->end, read_count, MYF(MY_WME))) == MY_FILE_ERROR) + { + buffer->error= my_errno; return (size_t) -1; + } DBUG_PRINT("fill_buff", ("Got %lu bytes", (ulong) read_count)); @@ -198,8 +203,7 @@ static size_t fill_buffer(LINE_BUFFER *buffer) } - -char *intern_read_line(LINE_BUFFER *buffer, ulong *out_length, bool *truncated) +char *intern_read_line(LINE_BUFFER *buffer, ulong *out_length) { char *pos; size_t length; @@ -214,22 +218,25 @@ char *intern_read_line(LINE_BUFFER *buffer, ulong *out_length, bool *truncated) if (pos == buffer->end) { /* - fill_buffer() can return 0 either on EOF in which case we abort - or when the internal buffer has hit the size limit. In the latter case - return what we have read so far and signal string truncation. + fill_buffer() can return NULL on EOF (in which case we abort), + on error, or when the internal buffer has hit the size limit. + In the latter case return what we have read so far and signal + string truncation. */ - if (!(length=fill_buffer(buffer)) || length == (uint) -1) + if (!(length= fill_buffer(buffer))) { if (buffer->eof) DBUG_RETURN(0); } + else if (length == (size_t) -1) + DBUG_RETURN(NULL); else continue; pos--; /* break line here */ - *truncated= 1; + buffer->truncated= 1; } else - *truncated= 0; + buffer->truncated= 0; buffer->end_of_line=pos+1; *out_length=(ulong) (pos + 1 - buffer->eof - buffer->start_of_line); DBUG_RETURN(buffer->start_of_line); diff --git a/mysql-test/t/mysql.test b/mysql-test/t/mysql.test index 2dcc77a16c2..aa774036d10 100644 --- a/mysql-test/t/mysql.test +++ b/mysql-test/t/mysql.test @@ -412,6 +412,12 @@ drop table t1; --echo --exec $MYSQL --skip-column-names --vertical test -e "select 1 as a" +# +# Bug#57450: mysql client enter in an infinite loop if the standard input is a directory +# +--error 1 +--exec $MYSQL < . + --echo --echo #