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bdk: fatfs: check if string is null for puts/printf
Avoid writing garbage to a file by checking string pointer passed to f_puts and f_printf. Important on many embedded platforms that do not abort on NULL dereference.
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e31d6446db
commit
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1 changed files with 6 additions and 2 deletions
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@ -4712,9 +4712,9 @@ DWORD *f_expand_cltbl (
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}
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if (f_lseek(fp, CREATE_LINKMAP)) { /* Create cluster link table */
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ff_memfree(fp->cltbl);
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fp->cltbl = NULL;
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fp->cltbl = (void *)0;
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EFSPRINTF("CLTBLSZ");
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return NULL;
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return (void *)0;
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}
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f_lseek(fp, 0);
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@ -6737,6 +6737,8 @@ int f_puts (
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putbuff pb;
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if (str == (void *)0) return EOF; /* String is NULL */
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putc_init(&pb, fp);
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while (*str) putc_bfd(&pb, *str++); /* Put the string */
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return putc_flush(&pb);
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@ -6763,6 +6765,8 @@ int f_printf (
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TCHAR c, d, str[32], *p;
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if (fmt == (void *)0) return EOF; /* String is NULL */
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putc_init(&pb, fp);
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va_start(arp, fmt);
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