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25 lines
867 B
Diff
25 lines
867 B
Diff
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Index: svgalib-1.4.3/src/fbdev.c
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===================================================================
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--- svgalib-1.4.3.orig/src/fbdev.c 2011-01-06 14:24:59.000000000 +0100
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+++ svgalib-1.4.3/src/fbdev.c 2011-01-06 14:27:39.000000000 +0100
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@@ -141,9 +141,17 @@
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if (page != oldpage)
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{
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// munmap(BANKED_MEM_POINTER, __svgalib_banked_mem_size);
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- mmap(BANKED_MEM_POINTER, __svgalib_banked_mem_size,
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+ long size = __svgalib_banked_mem_size;
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+ long offs = page * __svgalib_banked_mem_size;
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+ if (size + offs > __svgalib_linear_mem_size)
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+ size = __svgalib_linear_mem_size - offs;
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+ if (size <= 0) {
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+ fprintf (stderr, "invalid page %i requested", page);
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+ }
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+
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+ mmap(BANKED_MEM_POINTER, size,
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PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED,
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- fbdev_fd, page * __svgalib_banked_mem_size);
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+ fbdev_fd, offs);
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oldpage = page;
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}
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}
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