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ffm_write_write_index: check lseek() return code
Fixes CID732185 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -346,7 +346,8 @@ static int ffm_write_write_index(int fd, int64_t pos)
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for(i=0;i<8;i++)
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buf[i] = (pos >> (56 - i * 8)) & 0xff;
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lseek(fd, 8, SEEK_SET);
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if (lseek(fd, 8, SEEK_SET) < 0)
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return AVERROR(EIO);
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if (write(fd, buf, 8) != 8)
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return AVERROR(EIO);
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return 8;
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