musl - musl - an implementation of the standard library for Linux-based systems

fix buffer overflow in printf formatting of denormals with low bit set

empirically the overflow was an off-by-one, and it did not seem to be overwriting meaningful data. rather than simply increasing the buffer size by one, however, I have attempted to make the size obviously correct in terms of bounds on the number of iterations for the loops that fill the buffer. this still results in no more than a negligible size increase of the buffer on the stack (6-7 32-bit slots) and is a "safer" fix unless/until somebody wants to do the proof that a smaller buffer would suffice.

Diffstat (limited to 'src/stdio/vfprintf.c')

1 files changed, 2 insertions, 1 deletions