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Fixed potential negative value misinterpretation in load_file()

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(cherry picked from commit 42c3ccf36e)

Conflicts:
	library/x509parse.c
This commit is contained in:
Paul Bakker 2013-09-11 11:37:33 +02:00
parent 433fad261e
commit fe7c24caa6
1 changed files with 13 additions and 2 deletions
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15
library/x509parse.c
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@ -1836,16 +1836,27 @@ int x509parse_crl( x509_crl *chain, const unsigned char *buf, size_t buflen )
int load_file( const char *path, unsigned char **buf, size_t *n )
{
FILE *f;
long size;
if( ( f = fopen( path, "rb" ) ) == NULL )
return( POLARSSL_ERR_X509_FILE_IO_ERROR );
fseek( f, 0, SEEK_END );
*n = (size_t) ftell( f );
if( ( size = ftell( f ) ) == -1 )
{
fclose( f );
return( POLARSSL_ERR_X509_FILE_IO_ERROR );
}
fseek( f, 0, SEEK_SET );
if( ( *buf = (unsigned char *) malloc( *n + 1 ) ) == NULL )
*n = (size_t) size;
if( *n + 1 == 0 ||
( *buf = (unsigned char *) malloc( *n + 1 ) ) == NULL )
{
fclose( f );
return( POLARSSL_ERR_X509_MALLOC_FAILED );
}
if( fread( *buf, 1, *n, f ) != *n )
{