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libgcrypt/mpi: Fix possible NULL dereference

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The code in gcry_mpi_scan() assumes that buffer is not NULL, but there
is no explicit check for that, so we add one.

Fixes: CID 73757

Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Darren Kenny 2020-11-26 10:41:54 +00:00 committed by Daniel Kiper
parent e8814c8111
commit ae0f3fabeb
1 changed files with 3 additions and 0 deletions
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3
grub-core/lib/libgcrypt/mpi/mpicoder.c
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@ -379,6 +379,9 @@ gcry_mpi_scan (struct gcry_mpi **ret_mpi, enum gcry_mpi_format format,
unsigned int len; unsigned int len;
int secure = (buffer && gcry_is_secure (buffer)); int secure = (buffer && gcry_is_secure (buffer));
if (!buffer)
return gcry_error (GPG_ERR_INV_ARG);
if (format == GCRYMPI_FMT_SSH) if (format == GCRYMPI_FMT_SSH)
len = 0; len = 0;
else else