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util/nvmutil: tidy up io_args

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i don't like it grouped together. do it
all separate, for clarity.

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-14 23:48:27 +00:00
parent 8875a712ae
commit cedcb2c68a
1 changed files with 19 additions and 5 deletions
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24
util/nvmutil/nvmutil.c
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@@ -2126,14 +2126,28 @@ static int
io_args(int fd, void *mem, size_t nrw,
off_t off, int rw_type)
{
/* obviously */
if (mem == NULL)
goto err_io_args;
if (fd < 0
|| off < 0
|| !nrw /* prevent zero read request */
|| nrw > (size_t)SSIZE_MAX /* prevent overflow */
|| (uint)rw_type > IO_PWRITE)
/* uninitialised fd */
if (fd < 0)
goto err_io_args;
/* prevent underflow */
if (off < 0)
goto err_io_args;
/* prevent zero-byte rw */
if (!nrw)
goto err_io_args;
/* prevent overflow */
if (nrw > (size_t)SSIZE_MAX)
goto err_io_args;
/* prevent overflow */
if (((size_t)off + nrw) < (size_t)off)
goto err_io_args;
return 0;