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Check for IO stream failures in various format's truncate/seek operations

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For the formats that support seek and/or truncate operations, many of
the C library calls used to determine or set the current position indicator
in the file stream were not being checked.  In some situations, if an error 
occurred, a negative value would be returned from the library call.  This
could then be interpreted inappropriately as positional data.

This patch checks the return values from these library calls before
using them in subsequent operations.

(issue ASTERISK-19655)
Reported by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/1863/
........

Merged revisions 362151 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 362152 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@362153 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2012-04-16 20:17:03 +00:00
parent ba0f044bde
commit ba7032be5f
14 changed files with 370 additions and 89 deletions
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36
formats/format_sln.c
View File

@@ -72,13 +72,25 @@ static int generic_write(struct ast_filestream *fs, struct ast_frame *f, enum as
static int slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
{
off_t offset=0,min,cur,max;
off_t offset=0, min = 0, cur, max;
min = 0;
sample_offset <<= 1;
cur = ftello(fs->f);
fseeko(fs->f, 0, SEEK_END);
max = ftello(fs->f);
if ((cur = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if (fseeko(fs->f, 0, SEEK_END) < 0) {
ast_log(AST_LOG_WARNING, "Unable to seek to end of sln filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if ((max = ftello(fs->f) < 0)) {
ast_log(AST_LOG_WARNING, "Unable to determine max position in sln filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if (whence == SEEK_SET)
offset = sample_offset;
else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
@@ -95,7 +107,19 @@ static int slinear_seek(struct ast_filestream *fs, off_t sample_offset, int when
static int slinear_trunc(struct ast_filestream *fs)
{
return ftruncate(fileno(fs->f), ftello(fs->f));
int fd;
off_t cur;
if ((fd = fileno(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for sln filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if ((cur = ftello(fs->f) < 0)) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
return -1;
}
/* Truncate file to current length */
return ftruncate(fd, cur);
}
static off_t slinear_tell(struct ast_filestream *fs)